The third Q&A "How can I tell google that multiple domains are related?" - "Use Hreflang" doesn't make any sense. This question does not reflect the question as

The third Q&A "How can I tell google that multiple domains are related?" - "Use Hreflang" doesn't make any sense. This question does not reflect the question asked in the video, and the answer is incomplete. The question is about translated versions of international sites, that's not simply "related". And sitemaps work as well. I think the site is a good idea, but if one of the first three results is flawed I'm not too sure about the overall quality.