A bit outdated?
Can't help but think the author of this article is a bit out of date with regards Windows.
Sure, things needed to run as administrator, back on Windows XP and some badly written software still wanted it on Windows 7. But now? With Windows 11? Not seen anything that wants that.
And Windows today is built on NT, which was built with the specific purpose of being a network and muilti-user OS. So, the claim that "Windows is still built on a standalone PC operating system foundation" is simply incorrect.
The reality for many organisations is that Windows is the easiest option to implement. There are more Windows admins out there than Linux ones. At least, in their price range. There are more turnkey solutions that work on Windows than Linux. You can turn to MS for 99% of everything that may go wrong with running a network setup of Windows devices. Not so easy with Linux when there's 4000 options on how to do something.