I think it's just Atlus being dumb as fuck to be honest. This game isn't even on PC... Like yeah No Xbox, I understand, but no PC? This is the same dev that was shocked that P4G sold well on PC.
13 Sentinels is only published by Atlus, it's made by Vanillaware who is a 29-person studio. I believe they are handling Switch port by themselves. So asking them to work on a PC and Xbox port at the same time is a bit too much. Especially considering that the game is very niche and didn't sell that much even on Playstation