He's not backtracking, he's just stalled. He could have a good weekend and then everyone would be raving about his chances for the PGA. He will be fine.
He won his final start before the 1st 2 majors of the year and that didn't work out so well for him. Then, he misses the cut in his final start before the Open and has his best major finish post 2009. I wouldn't put too much stock into his performance this week. Didn't even arrive until Wednesday which tells me he doesn't care about this week. His focus is on next week.