How come 2000 rapid is equivalent to 2000 blitz on chess.com?

I hover around the 2000 rapid range nowadays yet my blitz is around 1600. Anecdotally, I have noticed this pattern on most of my opponents too, where their rapid is higher than blitz, even though by this data (which seems very credible, correct me if I am wrong), the gap after 1800-1900 range is nearly zero between the two modes.

https://chessgoals.com/rating-comparison/

The website confirms the effect is true on lower ratings, though, but I would even then suspect its an even bigger gap (e.g. 1000-1100 blitz to 1500 rapid, for example, not 1300 blitz to 1500 rapid).