User blog comment:Kogath/Monster Hunter: World Discussion/@comment-31029678-20190208002724/@comment-4370375-20190210085745

Except the game itself is being quite literal in there Final Fantasy and Witcher are both treated as parallel worlds.

Not being native to Monster Hunter =/= non-canon since TMNT has had countless canon crossovers since the franchise began, most notably with the Power Rangers as well as the character Miyamoto Usagi who is a recurring cameo across the franchise.