So you essentially confirm that GG was born from harassing women, and that lots of people continued harassing women even while people said it was always about ethics in journalism.

No at some point the leftover people at some point had an about face, and said from now on we don't do harassment anymore and it's only about ethics in journalism.

Let's consider this is true, but why on earth would this new "only about ethics in journalism" movement continue to wear the same GG label, and somehow be surprised (and annoyed) that people still associate the movement with harassment and mysogyny?

The Venn diagram between gamer gate adherents and 4chan based alt-right trolls is a circle.

no, they aren't all based off 4chan (mostly because 4chan booted them). And not all are alt-right anyway