This isn't a shot at Moose, I've been listening this happen for 20+ years. Disc golf has a weird thing where a club/serious player sees somebody playing and they start in on the "you should come to the club flight/join the club/sign up for our C-tier" spiel. So they person gets there, and then the people who play rounds with them grumble that they were thrown off their game because they had to play with someone that was that bad.
St. Louis had this thing in the 90's where they mixed divisions first round, basically saying that people like me that stink would be better for the "experience" of playing with the better players. So I'd play a round with and Open and Advanced guy, then walk up to the scoring table and listen to them bad-mouth me and blame their poor play on them being forced to watch me miss putts. Great. Like I asked to be on a card with them. BUT if I didn't want to deal with it and skipped the flights, somebody would be all over me on league night about why I wasn't showing up at the flights. It's a no win.
They let the dude sign up. They knew what his rating was. The other people on the bottom card were on the bottom card; it wasn't going to matter what happened there. If somebody was going to say regrettable things because this guy was playing, I'd hope they would be said to the TD that let him enter. Dude just showed up to frolf. Which is what we tell people to do all the time.