It isn't Sci-Fi in the slightest simply because the genre is defined by speculation and extrapolation of existing scientific concepts. For example, while there is no narrative difference between the Star Trek Teleporter and any of a variety of spells in D&D, the act is justified differently. In D&D, it is the result of a wizard manipulating the Weave - an energy inherent in the universe where in Star Trek it's the result of breaking a person down into a different form, projecting it as pure energy, and then reconstituting them at the other end. The difference, then, is that Star Trek offers an an explanation about the way the process works. If D&D wanted to do the same, it could say that (for example) the Weave was Dark Energy and a wizard was using some kind of device to direct that energy to a particular end. Mass Effect does this exact thing with spells simply being the result of modification of mass fields allowed for thanks to the existence of a mysterious element (Element Zero).
Even when it comes to sci-fi though there are degrees of qualification. Some settings have very little explanation for how things work; Doctor Who is effectively fantasy since nothing of consequence is ever explained in a rigorous way. By contrast, the work of Arthur C Clark is a very hard edged science fiction which rarely relies on plot magic beyond the notion that in the future, a device will be possible to build that we can only theorize about now.
Even when it comes to sci-fi though there are degrees of qualification. Some settings have very little explanation for how things work; Doctor Who is effectively fantasy since nothing of consequence is ever explained in a rigorous way. By contrast, the work of Arthur C Clark is a very hard edged science fiction which rarely relies on plot magic beyond the notion that in the future, a device will be possible to build that we can only theorize about now.