The continuity is a bit confusing. Casey talks about his father (who in IDW is Hun), and how he stitched him up in bar fights. April also says, "So that's how your father got all those frankenstein scars." But Hun is never name-dropped, so I'm not sure if that's him.
Meanwhile Don goes to Harold's lab and they see the same portal they used in the Ghostbusters crossover. Harold only exists in IDW continuity, as does this particular portal. So uh...?
Lastly we know it's not IDW TMNT because Karai calls herself Shredder's daughter (and not great great granddaughter), and she's at war with the Elite Guard of the Foot Clan. Both Splinter and Shredder are still alive, so even if you say it takes place before issue 50, it still doesn't fit.
Lastly Hamato Yoshi was mentioned and Bebop/Rocksteady exist. So it's almost like this is some weird off-shoot of IDW TMNT with similar events that played out in both.
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