Technically if you can do top dps during a raid, is because you’re not dying to mechanics, so a good skilled players will both do top dps and do the mechanics correctly.
A bad player will step on every swirl, die (and thus lose dps), ignore mechanics, press the wrong rotation buttons, pop offensive cds when the boss goes to intermission and becomes immune to damage (thus losing a ton of dps), and generally just do random stuff because a bad player doesn’t know what he’s doing most of the time
So yeah a good dps most of the time indicates who are good and who are bad players.