Given his reputation, I believe he's not lying. He can't deny that basically he's aging.
This, before he could handle those guys with ease (hence the pigeon, turkey status of guys who are beating him right now)
What I don't agree with is the lack of credit for the way Berdych played, he was brilliant in both defense and attack and got his head together
Sometimes Roger should just shut up, his racket isn't up to back his talking, so it's better to stay low and quiet