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I’m using Outlook (classic) in Win10 by way of Microsoft 365 Apps for Business.  After reading this, I checked and see Outlook (new) in the Start > Apps  list now, though I have not launched it.

Given Susan’s statement in the article, “If you put the following registry key in place ahead of time, Outlook (new) will not install automatically and will respect the block.“, will running an uninstall from the Start > Apps  list remove it enough to have the cited regedit entries work since the change would not be “ahead of time” anymore?

FWIW, the MS 365 Apps version listed in appwiz.cpl is 16.0.18324.20194, installed four days ago.