Puzzle ratings don't really correlate well to playing ratings. They mostly reflect the amount of puzzles you have tried.
The puzzle leaderboard shows one guy with 65,000 points. Do you think he's 20 times as good as Magnus Carlsen?
yeah defiantly more of a rating of how many you have done because as a 600 I had a 2100 puzzle rating. I think the point of the rating is more so "A ___ rated player will actually find this in a game" but the high end of the puzzle rating this kind of falls of ig
the 1525 is your puzzle rating, and the 1260 is the rating at which a person should be able to solve the puzzle in the target time, eg. 0:19. i hope this helped