Bingo: unlimited vacation is a scam
Someone I know who retired from a fairly senior position at Netflix rather liked it and took some fairly long vacations but said there really was a good tradition of umplugging at least as he observed that came from the top.
https://namely.com/blog/minimum-pto-what-is-it-why-you-shoul...
They don't do that for normal PTO but it's certainly feasible.
Pretty much no one (outside of maybe something regulated who may mandate two week PTOs for security purposes) is going to do that every time an employee takes PTO. In any case, if I really want to do work I don't even need access to my employer's computers.