Pls explain to me in the comments

White King is in check and can't move anywhere to save itself

It's been decades since I last played and my eyesight is less than optimal, but it seems like it's checkmate in one. Move rook to block. Queen takes rook. Mate. The app, apparently, saw the inevitable?

Of course bad boy samvit is playing chess

It's not, but it is mate in 1. The puzzles sometimes end before mate because...reasons.

please tell me this is a joke

no, sometimes in chess com puzzles you dont have to checkmate the opponent