Does 'not the best game of his career' = offside goal to stand ?

Just played a match where 4 of the opposition guys were clearly yards offside when the ball was played by one of those who were offisde, resulting in a goal that was allowed to stand without any 'dubious decision' 'players protesting furiously' etc.

In the after match report it said that the referee 'didn't have the best game of his career'. Does such a statement equate to allowing clearly offside goals to stand ? or does it equate to something else.

BTW I have seen the reports from other matches where it has said the SPECIFIC reason for the ref having a bad day.