Yeah, “minimal rubbing” can mean anything. As in, it probably rubs a lot. You can see the scuffing on the sidewalls in some of those pictures, that’s not a recipe for tire longevity. And it depends on use too- on a car that rarely sees street use you can get away with a lot more than one that has do deal with crappy public roads everyday.
The other thing is, he’s running 18x10’s. The minimum recommended width for a 315/30/18 is 10.5”, and the measuring rim is an 11”. So, those tires aren’t anywhere near the advertised width specs for those 315’s. I bet they measure more like 295’s for width.
I think on my car I could probably run 285’s on 18x10’s and make it work with the fender rolling I have. That’d be about it though for my car. At least at the height I run it at on the roads I frequent.
I mean, I guess if they’re 9” drum spindles it could be a problem. But if they’re 10” drum or KH spindles then I wouldn’t worry too much about it. Sure the bearings could be bigger but it’s not a catastrophic issue. Just eat wheel bearings faster.