[neatoman]

For what it's worth, I think this show was modeled on the 2012 show in some sense. It has many similar stylistic choices and both shows seem to think being stupid just to have stupid things is a good thing. Maybe it's written with the intention to be the future of that Usagi, all the typical Usagi characters aside from Jei and Usagi himself were missing from the 2012 crossover, not to mention how this show has them in the "1000 years in the future" setting instead of Usagi's lifetime.

That said however, I don't think it can be legally considered a spin-off to the 2012 show. The show will most likely never feature any direct references to what happened in the 2012 show or the TMNT in general. If the TMNT do appear against all odds, I'm not so sure it will be that particular version of them. The most realistic outcome you can hope for is that legally distinct copycats of the TMNT show up.