For a year, I worked for a "company" that had season tickets to almost every single team across the four major sports leagues and resold them on Stubhub, Ticketmaster, Vivid Seats, SeatGeek, etc. This law is targeted at those people. I have a feeling the ambiguity of the law means the Sabres ticket sales reps aren't sure how it impacts their season ticket holders who sell the majority of their tickets.
The likely smart thing for those folks to do is just buy smaller packages for games they actually go to.