Yep, I've semplified. What I understood from this post is that net framework is in "maintenance mode": probably MS plan a 4.8.1 with but fixes and maybe a 4.9 with some minor updates, but .net core (now simply .net) is the place where new things will be developed.
Nothing in the article suggests maintenance releases, but MS' history is probably enough for that. The article does definitely state that .Net 5 is the evolution of Core and will be the entire platform going forward. I'm, personally, glad to see Core/Framework/Mono etc rolled into a single version at 5. The previous split versions have been fairly confusing.
"Both .NET Framework and .NET Core will move forward, and both will be fully supported"
???
Which is why I found this one confusing... because it essentially says the opposite.