An 800 on Chess.com is dfiferent than an 800 on f.ex gameknot correspondence chess. On this site an 800 is definitely intermediate, knowing quite a lot about amateur chess.
They know general opening principles (develop, develop, develop), general endgame technique (Lucena and Philidor), and they love tactical blows and fast checkmates. (forks, pins, discovered attacks, Anastasias mate, etc,etc)
800 elo players are below average and pretty bad, missing a lot of checks and other things
800 ELO players are objectively well-above average according to the site's own percentile readout of the global average curve.