[apologies for hoofing an old thread but this had been on my mind since I only ever really play against the bots, usually for a few minutes now & then when I'm on an underground train with no internet access].
The bots obviously don't play exactly like human players, being, relative to their ratings, disproportionately weak in some facets of the game, and disproportionately strong in others.
But my instinct is that the bots' ratings are about right for blitz chess [e.g. 3-5 minute chess.com games], maybe especially towards the faster end of that range. The bots' ratings are too low against a player who's limiting himself to bullet timescales, and too high against a player who's taking a decent amount of time.
Sorry for any grammar errors 😅