The difference of riding in a pack and riding solo:
https://www.strava.com/activities/1798450928
https://www.strava.com/activities/1798491702
Fairly same overall effort, but a hell of a difference in speed.
My max was 300 watts less than that guy, but those peaks are usually out of corners, to stay with the pack. Alone, I could just go full gass round the corners, no need to accelerate.
It's mostly an age decline. The rider you list had a peak HR of 198, Ave 173bpm. So 26bpm swing,. Your HR swing 9bpm. Youngsters just have greater capacity.