I don't think everyone should read too much into this. Truly. I expect many more "Leaks" and fictional leaks between now and TGS.
As for looking like the PS5 version of FFVIIR, who cares… My reasoning is, we don't have enough information. Did this game look like PS5 graphics in portable mode or on a tv? You could hide a lot of blemishes in portable mode. Which I suspect is what they were working on. Again, If real at all!
Regardless, i think it is a safe assumption that FFVIIR comes to Switch 2 at some point. Of course, if Square is acquired things are subject to change. But, I think it is near a 100% at this point.