The third-seat Flannery 2♦ call (11-15, 45xx or 46xx) was not alerted.
South actually doubled the alerted 3♦ call, which should have been a responsive double.
When West bid 3♥, East summoned the Director and informed the opponents that he had failed to alert 2♦ and that the 3♦ call was an invitational raise, West's 3♥ call showing a minimum. West claimed later to have only remembered their agreement after bidding 3♦.
South was asked if she would change her last call as a result of the new information that 2♦ was Flannery. She chose to change to a pass and West repeated the 3♥ call.
The opening lead was the K♠, allowing a quick spade pitch, but the contract went down when South began with the Q♦, losing a trick to the J♦ and eventually two clubs. N-S chose not to press this until after the scores came out.
Should there be an adjustment here?
ACBL alert procedure does say to inform the opponents as soon as you realize you have forgotten an agreement. I found nothing about whether you need to let the opponents know which bids you made while you were unaware you had an agreement. How you would do this without letting partner know as well seems a bit of a problem. But clearly the wording of the clarification left N-S in doubt: has East forgotten to alert holding an invitational hand, or has East forgotten the agreement and was raising a third-seat weak two?
To make things even more complicated, North, an experienced player with lots of Flight A and top bracket experience, feels that South's withdrawn double is UI to him and would have bid 3NT (and played low to the A♦ of course) instead of doubling had he known Law 16D1. But he also claims to have no doubt as to what was going on, so the question may be "why didn't he then?"