My read of the decision is that it would be only the subset of males who:
A.) Ordered Pink IPA during the promotional period it was available
B.) were under no other restrictions (i.e. Legal Drinking Age, Ban from premises for prior behavior, lack of stock)
C.) meets at least one of the following two criteria:
1.) Were refused the sale of Pink IPA because of their gender
2.) Were forced to lie about their gender identity in order to buy the beverage
That is providing that the defendant did not successfully appeal the decision to a higher level court and had the decision reversed or overturned. I assume that the date of 2024 is with in the 5 year window for such action to be taken for a civil suit, however, I am unfamiliar with British Law's rules on that matter. In the U.S. the cut off is 1 year from date of incident OR the date plaintiff became aware of the cause for the suit. If the later, they would certainly have to show evidence that they were only aware of the illegal behavior after the fact. I do believe that finding a case where one made the complaint in a timely manner and suceeded is not sufficient for this matter, and they would have to demonstrate that they had no clue the behavior was a violation of the law until the later point.