brent It also made me think of the curious case of Windows 7 which defies any of these definitions. It was declared dead/End of Life at a specific, announced date then last rites read, ashes to ashes, and even replaced. But then kept on life support (patches and regular KB updates) for 2 years or more.
Microsoft uses a somewhat different model, contrasting with most Linux LTS release cycles. Microsoft tends to support Windows releases for 10 years, in contrast to Linux LTS three-year support cycles, and Microsoft lets Windows releases down in steps over a period of years.
Windows 7 reached end of life 2015. After than point, Windows 7 stopped development, and no feature updates were issued, but technical support, software updates and security updates continued in the form of KB updates until 2020. After than point, Microsoft technical support, software updates and security updates ended, except for customers paying for Extended Support, which will end next year.
Windows 10 follows a similar model, although more complicated because Windows 10 versions each have EOL dates. The schedule is more complicated, but the principle is the same. Windows 10 21H2, for example, will continue be updated through 2023, but support will end in 2025.
In the case of Windows 7, Microsoft issued a few critical security updates after 2020 to all and sundry, paid Extended Support or not, as a result of threats so severe that the Microsoft ecosystem was threatened. That will probably be the case for Windows 10 after end of support is reached in late 2025, as well.
At some point, though, the party ends, and a Windows edition is no longer supported at all. Windows 3, 3.1, 95, 98, NT, XP and other early editions have met that fate, and it is dangerous to use them. The same is true for Linux. The doesn't stop diehards from continuing to use Ubuntu 4.10 (Warty Warthog), or Windows XP, but at significant risk.
As you said, Windows life cycles do not fit neatly into the LTS versus rolling release models used in Linux. Chalk and cheese, in fact. I think that's the takeaway.