They’re wing bars, so through-fit.
TBH, that was my first thought too, but looking at it I’m less sure. It does make sense though.
Kinda surprised if that is the case though. I’d expect better of Thule (ie, if there was a risk, they’d say so or not sell the product). It’s a fairly new car design though, so maybe they’re not as tried and tested as they could be yet.
Thinking about it though, they were a bugger to fit. The measurements given for the foot spacing were too short, I’d to move them 1cm or so out on each side to get them to line up with the raised bodywork; without doing that, even wound out fully the feet adapters would’ve been like an inch too short. (From memory, the sizing listed was the same for the i40 and i30, which can’t be right.)