How Accurate are the Computer Opponent Ratings

I'm especially interested in how accurate the computer ratings are between 1700 and 2200.  Have these been tested and verified somehow?  Are they just a guess?

So if I play and beat the computer opponent rated 1800 4 out of 4 games (2 white, 2 black) does this mean I have a real good chance that my rating would be 1800+?

The site estimates the ratings, but bots don't play like people, so many of them are overrated. I can't speak specifically to the 1800 bots, but a lot of the lower ones are overrated for sure.

I agree these are likely overrated. I’m a beginner with a chess.com rating in the 900s (my highest rated win was against a 1070) but I can regularly beat the bots up to about 1200, and go 50-50 with the 1300s. I’ve found that if you can make it to an end game, the bots tend to blunder much more than the human opponents I face at the 800s-1000s range