Ah, so all white supremacist symbols aren't real becuase the okay one was made up. I get it.
Let's apply your logic to another situation. Jessie Smullet made up a crime. Therefore all black people make up crimes against them. I wonder if we have a debating fallacy for that..
Or, perhaps, you can find us some 4chan evidence this was made up (i dont expect you to do this. The article didn't bother to explain the symbol, leaving us wondering what they're talking about. Thats poor reporting. That's on them.) This could have been a Hail Hitler motion for all we know
No the Thumbs up symbols isn't white supremacist because Trump uses it. Other people have and do use it for the intended purpose too.
No 88 isn't a sign that some-one is a White supremacist because some people put their birth years in names etc so 88 could just be they were born in 1988 or they're a fan of a person who races in Car 88 in a sport and the driver had no choice in the number they were just assigned it.
No norse runes don't mean some-one is a white supremacist, some people just find norse shit cool.
No liking Pizza doesn't make some-one a pedophile. Just because the journalist who went by Dr Pizza for a while on twitter who had the Pizza emoji in his bio turned out to be a pedophile.
I'm saying we need to stop using symbols being used as evidence to confirm peoples biases.
If you want to bring up smullet, how many people looked at the symbol of the noose and his descriptions of people in red hats with white hoods or masks attacking him and went "Yeh those symbols add up must have been Trump supporters". That was confirmation bias. You know this happened other times.
Guys drive way sprayed with pro Trump racist stuff and his car torched......... Turned out to be he burned it for insurance money.
Church burned down and pro Trump graffiti found sprayed on it? Turned out a guy from the Church as covering up a crime he was committing.
Pro Trump supporter accused of pulling off Muslim girls headscarf? Turned out she made it up and there were no actual police reports made by her of it happening.
Synagogues getting anti-semantic bomb threats. Turns out it was one of the main reporters reporting on such stories doing it.
Oh and I did look it up BTW. Here's The Symbol he made

It's the OK sign
www.adl.org
This is thanks to a 2017 hoax campaign started by members of the notorious website 4chan that has since taken on a life of its own.
The 4chan site is an anonymous discussion board with an outsized cultural impact on the internet. It has been responsible for everything from the “I can haz cheeseburger” cat meme to the concept of Rickrolling. There is little that 4channers like as much as a hoax, and in recent months, they have served up a number of fakeries with white supremacist themes to largely credulous online audiences.
The “OK” hand gesture originated as one of these hoaxes in February 2017 when an anonymous 4channer announced “Operation O-KKK,” telling other members that “we must flood Twitter and other social media websites…claiming that the OK hand sign is a symbol of white supremacy.” The user even provided a helpful graphic showing how the letters WP (for “white power”) could be traced within an “OK” gesture. The originator and others also suggested useful hashtags to help spread the hoax, such as #PowerHandPrivilege and #NotOkay. “Leftists have dug so deep down into their lunacy,” wrote the poster, “We must force [them] to dig more, until the rest of society ain’t going anywhere near that s***.”
Following the cues of the hoax’s originator, 4channers created fake e-mail and Twitter accounts and bombarded civil rights organizations, journalists, and others with messages furthering the “OK” hoax. It is possible that some of the hoaxers were racists or white supremacists themselves, as parts of 4chan are something of a haven for them, and the site itself has been a source of adherents of the alt right segment of the white supremacist movement.
The original launch of “Operation O-KKK” sputtered after a few days and it seemed that the hoax had run its course without spreading too far, but it picked up again in late April and this time was far more successful in spreading across social media—and beyond.
It is important to realize that the “OK” gesture is a nearly universal hand gesture and most usage of it is completely innocuous. Even when used as described here, the fact that white supremacists, the alt lite and many Trump supporters all use the symbol means that one cannot assume that anyone who poses with such a gesture is intending or exhibiting an association with white supremacy. Only if the gesture occurs in context with other clear indicators of white supremacy can one draw that conclusion.