A couple years back John Reilly posted on HN "How I ruined my SEO" and I helped him fix it for free. He wrote about the whole thing here: https://johnnyreilly.com/how-we-fixed-my-seo Happy to do the same for you if you want. The quickest win in your case: map all the backlinks the .net site got (happy to pull this for you), then email every publication that linked to it. "Hey, you covered NanoClaw but linked to a fak…
If I was the author, however, I'd still feel like I've been put in a predicament where I need to spend personal agency to fix something that Google has broken.
While that may just be a fact of life, my internal injustice-o-meter would be raging. Like, Google is going to take hours of my life because they, with all their billions of capital, can't figure out the canonically-true website when it's RIGHT THERE in the GitHub repository?
Ugh. I guess that's just the day we live in. But it makes me rage against the machine on the author's behalf.