The Linux kernel is NOT an OS.
Any given Linux distro which is not compatible with any other Linux distro or even its own earlier or later versions couldn't be called an OS. It's a software compilation for a certain time period.
An OS implies everyone runs it, anyone can compile software for it and have it run on all devices with this OS. This is impossible with Linux outside of Snap/FlatPak/AppImage which themselves are lightweight virtualization solutions.
This is what Windows, MacOS, iOS and Android are. Linux is not.
Also, please don't throw FUD around without explaining yourself. You probably don't even know/remember what it means any more.