Today's "puzzle of the day" is way underranked

The puzzle in question:
lichess.org/training/5vEM1

This is easily a 2000+ puzzle, but it's only rated 1800 because you don't have to find the final moves. How many people are playing "4. Rxa2?"?

The puzzle had to end with Ra8+ because on the next move both Kh3 and Kf3 win, and Lichess puzzles only ever have one correct move (unless multiple moves deliver checkmate).