When I dumped the media out in the trash, a few fungus gnats came out with it! But I sealed the trash bag before they could escape.
Snipped off all the rotted roots, and repotted in rePotme Dark Classic and put back in dining room.
Has 5 viable green roots…on shorter side, but healthy. Rinsed roots twice to soak them green. Leaves not crinkled but still has "bunny ears". 🐰 I'm now semi-hopeful!