Fingerprinting: EFF Cover Your Tracks shows actual OS/CPU architecture as platform

I run Tor Browser on openSUSE Tumbleweed, and when I was checking EFF's Cover Your Tracks, I noticed that despite TBB's user agent saying Windows 10 and no CPU architecture, Cover Your Tracks shows the actual platform used, in this case, Linux x86_64.

I decided to whip out my MacBook (not my main laptop), and tried the same EFF site, it says MacIntel:

For reference, a Windows screenshot (from my work ThinkPad) is:

This means websites can still fingerprint by OS despite a "Windows 10" user agent without any architecture, and also the architecture on Linux/Mac/BSD even though it's not in the user agent.

EDIT: What I meant to say is that in the JavaScript settings, we should only say Windows (desktop) or Android (mobile), and nothing else, like we do in the user agent. This will make it harder to fingerprint Mac and Linux users.