My understanding is salaries are higher in the US in part because of the lack of universal healthcare, and other things that end up coming out of people’s pockets when compared to Europe. I did a little digging on the site, and it does look like salary and benefits are up to 80% of the cost.
The entire thing is based on their refusal to think anything other than the starting point is equal. When you base your view on that, everything they are crying about makes sense. It explains a lot. They think being gay or Trans is a choice too.