Surely it's not that difficult to understand. He was not good enough, he knew he wasn't good enough. So instead of finishing 9th at 1m10 on the day, he helped out Lecerf and finished 11th at 1m29. He wasn't going to win GC, so he had nothing to lose (he doesn't care whether he finished 5th or 7th in GC). Just try and win the TT now.
Think he would have finished better than that. I was thinking third with CROD