After some deeper inspection, this site is awful and I would recommend against using it. They try to block blockers at every turn, including loading in a significant load of tracking first-party (making it impossible to block.)
For now, I’ve hidden their ads, as I can’t block them outright. (Update will be out later this weekend.)
However, because they are still loading in all this junk on to the page, because we can’t block it, it’s making it very hard for me to debug the site and do simple things like hiding the empty ad boxes, because every time I open the web inspector, the whole page crashes after a couple of minutes (and my MBP is a pretty capable machine!) I don’t know the extent of what they are loading in, but I can tell you it is unlikely to be good!
I’m going to keep the issue open and try to handle the rest of it at a later date.