Ok, but the point is the same - a huge amount of human records and skills are scored against a moving backdrop of human scores that are current competitors.

Federer getting grand slams - all against local in time competitors - is impressive. Had he played 50 years ago, he'd have likely gotten more. Had he played in 50 years, likely less, expecting competition to improve.

Same for NBA records - all against a moving, relative backdrop.

Same for wrestling, baseball, hockey, and on and on and on.

Just because your score is relative to others does not make reaching some milestone, especially this one, less impressive.

Also, it's easier to have a higher ELO if others do too, not the other way around.