This puzzle should not be in the underpromotions section.

lichess.org/training/underPromotion/kw02q

you don't have to promote to a rook - you can just promote to queen with checkmate.

Hmm good point.

I see dozens a day I disagree with.

The correct thing to do is to vote. Tags are not assigned through this forum. They're assigned by LiChess users voting.