Pepper: T6 is marked incorrect, but after white T6, S6, S1 white lives. Similarly white S6 lives. Neither T6 nor S6 loses white a stone.
Ivan Detkov: T6 is not losing material but it is not helping either. In the game, this move will just lose two ko threats. This is an example of Aji Keshi - a bad taste and a bad move.
pro