Still there for me, along with the rest of the cat bots
What happened to Mittens?!?
this just now happened to me to me the bots are now A.I how it says the most powrful one of them is "agent chess" (2700 ELO)

Mittens is the best and i like always see her there whenni play with Cats, that theme of bots meehhh i prefer play with the other ones... Hope Mittens returns to smash Agent Chess xddd and show him "what is his place"

Sorry, I didn't post a link to my suggestion thread. Here it is: https://www.chess.com/forum/view/site-feedback/suggestion-keep-mittens-as-a-personality-bot-76524909
The bot appears to of disappeared...