I don't see any new insights on the page that you linked. I personally signed copyright transfer forms that allowed for author's versions. There were some conditions that I don't remember in detail. But the gist is that a commercial publisher still allowed me to have a version of the article text online.
They make you go through hoops and remember you - after a few requests the paywall emerges.
In this modern day, with publishing costs steadily falling, their demands for payment have become ever more demanding