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The article has nothing to do with IPv6.

The whole point of the article is that Google's sender identity scoring system is more strict when the sending IP is an IPv6 one. That's a pretty clear cut link to IPv6, no?

Google is really strict in general about these kinds of things. I had to go a few rounds with my VPSes before emails from them would consistently not end up in spam, but looking at the headers I'm mostly using IPv6 so I don't draw the conclusion "don't use IPv6" just "if you have IPv6, which is more likely than not now, be careful and read the docs"

Let me rephrase: the whole article is equally valid for IPv4. Being more or less strict is a claim the article makes without proof. And as far as my experience goes, there is no difference.

So standing by it: the article has nothing to do with IPv6 per se.

Huh? I'm not even sure how you came to that conclusion.

Gmail is probably tougher on mail servers using IP6 addresses because they're plentiful and I suspect spammers were having a field day setting up temporary mail relays forcing google to play whack-a-mole.

I used to run my own email server years ago but spam and spam protection measures have made it time consuming and annoying. I'll leave it to the professionals.

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