That's a different claim though. Obviously they'd use cookies and source IPs when they're available, because why not use all of the information available to you. That browser fingerprinting is good enough that neither of those sources are necessary is for you to decide on whom to believe.

On that topic, though, is the Mullvad Browser, who's entire intention is to defeat browser fingerprinting.

I need to test it, that reminds me, thanks. So many browsers. Does it support multiaccount containers?