Not always, Microsoft lingers like a fart in an elevator on some laptops. =3
https://techcommunity.microsoft.com/blog/windows-itpro-blog/...
“Note: Affected third-party OS includes MacOS. However, it's outside the scope of Microsoft support. For Linux systems dual booting with Windows, Windows will update the certificates that Linux relies on.”
Yes, always. The link you pasted doesn't prove otherwise. It just shows a luck of understanding UEFI