As far as I know, Ken did not make an excuse for that, or any other loss. Trabert was not a player he would lose to, at that time, by such a lopsided score unless something was either wrong with him or Trabert would have to be playing out of his mind. I read in a book I think, 20 years at the top, that Ken was suffering from some sort of virus at that time. Some fans here of Federer and Nadal are always claiming that the only time these guys lose is when they either have Mono or some sort of injury.
It appears that you agree with that, given your comments on Rosewall and Roland Garros 1959.