True, but I still don't get what grandparent was talking about. Comparing Elo ratings of what why?

Of your account that plays with the aid of a chess engine and the one where you play unaided.

Oh okay, right. Well yes hypothetically if there was such a rule, yes you could do that. But there never will be such a rule so I have never and will never play with computer assistance. On Lichess or over the board or anywhere else. And even hypothetically I am not sure what the point would be of proceeding as you suggest. Obviously I would be better with the computer assistance and have a higher Elo. But only once I got my engine up to be much stronger than me (otherwise there'd be no point in bothering).