It’s a meme pic, so I’m just wildly gesticulating and making giant assumptions here: I doubt it’s the “mushroom” fruiting body that’s doing anything in this research. It’s almost certainly the mycelium or we’re dealing with something like slime molds or yeast which don’t produce mushrooms at all.
Yes I made this comment without reading the rest of the thread or hunting down the story. Sue me.
When I was a kid, we used to coax wild anoles into biting our ear lobes and wearing them around like earrings. Maybe the kitty is doing the same as a labret piercing.