It talks about that spec does not say where structs go. And yet, all existing implementations today have more or less identical behavior (and by all I mean .NET (CoreCLR), Mono (the dotnet/runtime flavour), Mono (the Unity flavour) and .NET Framework.
With that said, only respect to the article's content and, of course, Eric Lippert. For the context of the discussion, however, it may be misleading. C# has gained quite a few low level primitives since it has been written too.
It was posted yesterday, 4 March 2024.