As for their comment "if you are tempted to quit windows10," what the hell are they suggesting as a replacement, nothing it would seem.
There's also macOS/Linux/Android/iOS or even Win7/8/8.1 (if you prefer MS).
For me that is crazy, switching OS for a browser related issue, changing your whole way of working. Not to mention it would probably require a complete reinstall on your system, even if you tried using a Virtual OS on that system. But that also be vulnerable to the Host system vulnerabilities (I've never installed a virtual OS).
The Mac OS isn't without its issues as has been recently under the spotlight. As for falling back to an older windows OS, who is to say that the same vulnerability isn't in that old code also.
And finally, this issue has had this vulnerability closed, with older OSes about to reach end of life/support (Win7) they aren't normally going to receive these patches.