Surely the question was not whether anyone could break the OP's choice for anonymity. The question is: Should they?

Whether the choice for anonymity is a valid chioce in this case or any other is an interesting debate, but irrelevant.

Whilst the choice exists, it should be made clear whether that choice has any meaning beyond "nobody--except any God that whimsically decides to look--will know who posted".

It's been stated elsewhere that there are certain activities and procedures that will enevitably lead to the authorised person carrying them out to encounter private information. I also seem to recollect that this was a) rare, b) came with the suggestion that any such authorised person making such an encounter would keep the information to themselves and "try to forget it".

Unless PM has processes in place that routinely cross-reference the ip of anonymous posters with the ip's of known posters, and routinely present this information to God's as they log-on, it would seem likely that the discovery of the OP's "true identity" was rather more than a chance encounter during routine operations.

Given that the OP was hardly controversial, in no way rude or offensive, and phrased as a very open question, there seems little reason for tye to ..use his powers to discover that true identity, other than to say "I have the power". Which doesn't seem to me to be a valid justification, and makes mockery of the notional anonymity provided by Anonymous Monk