This is such bad advice that I can't take the rest of this guide seriously.
Edit: The rest is even worse than I was expecting. E.g.:
> execute/ open new files with one-day-delay because after one day, the malware is not 0-day anymore
> use the only browser on Windows that natively supports hardware isolation: Edge
that feels like a 200 IQ solution against 0days
"Just use your computer one day after the 0 day"
I would isolate it for a few days (no power on, disconnected from any network, etc). Then use a burned DVD or USB with MSFT's Offline Defender. The extra few days really seemed to help the definitions catch up with whatever had infected the system in the first place.
I do not believe Offline Defender can do this anymore, so this exact approach is probably no longer doable. I also do not do family IT anymore, so I have not had to do this since Win7's heyday.
E.g. "7-Zip doesn't have anti exploit support". Dug in to the source for that claim - it's a forum post of someone running Windows XP in 2020 (!) with an ancient version of Malwarebytes.
https://landave.io/2018/01/7-zip-multiple-memory-corruptions...
I mean this has to be a joke, right?
https://www.trendmicro.com/vinfo/us/security/definition/zero... says that the definition of a zero-day vulnerability is "a vulnerability in a system or device that has been disclosed but is not yet patched." There's no magic patching fairy that comes after 24 hours, so it's still a zero-day after that for as long as it takes someone to patch it.