Maybe I was just lucky, I wanted to try again just now, but whether I set Colorblind Mode to true or false, I always get white blocks, weird...
I swear it was working fine when I played it just now. I played with color restrictions and felt the Tetris AI was near invincible. I didn't have to watch which block went where, I could just keep dropping them in and they would find a spot for it and score some lines.