lol, whut?

Microsoft created the ".NET Standard" for this. Literally anything that targets .NET Standard 1.0 should work from circa 2001 through modern day 2025. You still get the (perf) benefits up the runtime upgrade which is what the blog post is about.

.NET Standard is more for maintaining interoperability between .NET Framework and .NET (Core). At this point only (very) legacy applications should be on Framework. Everything else isn't, so they shouldn't use. NET Standard as a target because it limits the new features they can use.