You said they studied, study does not mean playing classical. Study mean studying. Studying past games, puzzles, excercises etc... And I agree lol. One can study and play blitz all the same. Playing classical is not nescessary according to your own logic. You are in denial.
Of course GMs study chess. And you admit you lied about my saying playing classical is NOT the way to learn to play chess well. Putting things people never said into their mouths and ignoring their replies is par for the course for you. And then you wonder why your "revelations" never convince anyone that you are right and so few people here take you seriously.
The longer the time control, the fewer mistakes.