This is pretty good advice. I have a friend who works in a call center who found another job due to COVID-19 (started looking when they said they were going to lay everyone off, it's an affected industry). She took 3 weeks vacation from that job, then started the new one. The new one was a disaster; training was disorganized, IT can't get them the right access, and the actual job wasn't what was expected. She quit the new job, and will just silently return to the old one after her vacation is up.

I've never thought of doing this, but it's genius.

(Note to programmer types, though; you might have signed something that says you won't do this. Recommend legal advice or at least a backup plan for if you get caught ;)