I disagree that he doesn't rep much, plenty of Ax want to play this way, would be overextending something like AJ to go for 2 streets on turn and river. ICM also favors more passivity on the turn even from strong hands. I don't think 76 is a mandatory bluff but I do think it's a pretty good one. Sizing is an interesting question, solver was playing block or pot rather than the medium size used in game.