I still think its not a good thing if people representing one team go stand outside the locker room and film and record, but when you're looking at things like this from the legal perspective you ask whether the person had a legitimate expectation of privacy in the place where the recording was made. If someone leaves their phone inside the locker room as a surreptitious recording device that's different than someone standing outside a locker room and hearing the loud yelling coming from within. If this recording was in fact made by someone walking down a hall where they have a right to be, then while it feels a bit slimy its hard to be outraged and claim it was a major injustice (much less claim that it should lead to a vacated win).
I get so tired at the outrage in our society over every single thing. BYU fans outraged at Dillingham and some knucklehead kid who went inside the BYU tent, Whitt outraged his guy getting injured so he (apparently without any real medical analysis of the play in question) decides to assert publicly exactly when during the play the injury occurs (knowing this will absolutely lead to assertions of dirty play), etc., etc., etc. People automatically deciding which side of the outrage they are on based on who benefits. So many people in our society have almost zero objectivity.