It's the only site that has an LCP* that's much faster than the LCP (3.4s vs. 7.3s for the TS8C) so there might be a small optimization that could be done that would hugely improve LCP? The content mostly shows up, but then stuff ends up moving around a bit or something?
I didn't try to debug this, but it might be worth looking into seeing if there's an easy way to hugely cut LCP on slow devices since I'm told that this is a ranking signal for Google search.