I don't see the problem with the last two you listed, seeing as right near the top of the article it says - .NET 5 = .NET Core vNext They are basically taking

I don't see the problem with the last two you listed, seeing as right near the top of the article it says - .NET 5 = .NET Core vNext They are basically taking .NET Core and getting rid of the Core aspect of the name since it will be the only actively developed version of .NET going forward.