In the end, if nobody is maintaining the OpenGL standard, implementations and tooling it doesn't matter much whether it is officially deprecated or just abandondend.
Look at Mesa release notes for example, there's a steady stream of driver feature work and bugfixes for GL: https://docs.mesa3d.org/relnotes/25.2.0.html (search for "gl_")
A slow moving graphics API is a good thing for many uses.
People are writing new OpenGL code all the time. See eg HN story sumbmissions: https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...
It's not slow moving. It's completely frozen. The Mesa guys are the only ones actually fixing bugs and improving implementations, but the spec is completely frozen and unmaintained. Apple, Microsoft and Google don't really care if OpenGL works well on their platforms.
but, literally this article is about something new that was added to the OpenGL spec
I suppose the same is true of Direct3D 11, though. Only the Direct3D 12 spec has been updated in years from what I can tell. (I'm not a graphics programmer.)