AMUSING, INTERESTING, OUTRAGEOUS, or PROFOUND

but when you were shown to be wrong about your 30%

You showed nothing. Both the US and Europe mostly rely on making the employer pay, though in Europe it's typically mandatory and sent to a national system rather than the employer deciding by itself (or not) to pay for a private insurer for varying level of coverage. So there's just no way the US employers pay 300% more for a system which is "only" 50% more costly.

(also co-pays are fairly standard everywhere in Europe, to avoid abuses)

So that’s my best guess at your motivation, but please correct me. Why?

My motivation is fighting misinformation. Just because the misinformation comes from the side you support doesn't mean you should ignore it. In this case someone just made up shock numbers to get engagement and clicks, and that's not how you support a sound health care policy.