It’s possible that there is a way to for example bypass a company’s WSUS server but I don’t know if there is such a way and I couldn’t find any obvious way when searching.
Due to the source being hearsay I don’t really feel convinced and if I were you I wouldn’t spread such information further unless you found reliable sources first.
I’m open to any information about it if anyone can find any reliable information like documentation or blog posts from MS employees.
Still I highly doubt that is used often at all if it even exists. Only to be used in the absolute direst of times. I would also trust Microsoft much more in such a case that a third party like Crowdstrike.