I'm still not getting this application of it, is there a word-wizard willing to condescend us some further explanation? Pretty please ...
It’s not a Saxon genitive, it’s a grammar mistake.
The “possessive apostrophe” is the Saxon genitive. I was replying to that part but I admit that it was confusing. I should have quoted the part I was replying to
Yeah, but apostrophe-s followed by ‘is’ is just wrong.
In the title of the article it's a spelling mistake but it is not "just wrong" in general. "China's is more advanced than Russia's" is a valid sentence, for instance, we just lack context to know what it is comparing.