HugMonster
The IAA received the pilot's complaint last week (according to the press report) so they may well have been carrying out an audit of FTL records in the run up to the reported meeting.
While BALPA may have received several complaints no where in the report does it says that these have been passed to the IAA or Ryanair. I don't know whether BALPA has passed the information but if they had I would have expected that to be mentioned in the BALPA statement. The IAA cannot investigate information they don't have.
The statement that no pilots have exceeded limits does not necessarily mean that there are no weaknesses in the scheme. The IAA may well have identified some in an review following the complaint. With regards to new recruits and pilots on sick leave they may well only be flying for the airline for say last nine months of the set year and have a theoretical limit of 900 hours in that period.