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Google's next-gen reCAPTCHA system could spell trouble for de-Googled phones
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
I has nothing to do with the version number itself.
It has to do with the functionality that version includes.
Meaning thar there will be websites that would ask for you to scan a qr in order to access them. And that qr scan could only be done from google play services after that version.
My thinking is Android refuses to install things of a lower version number generally so if play services was higher it might refuse updates.
Doesn't solve the likely needing root to patch it of course and if you have that you might as well just replace it with Micro G or similar.