Earlier quoted context omitted.
From what I understand about the PH algorithm, votes for a product that directly come from the link are not valued as much as votes that are organic (either from the homepage, if you search for the product, find it in a collection etc.)
Of course, there is a "workaround" where people post on public forums "my product was featured on the Front Page of Product Hunt!" with a link to the front page, and the implication is clear. Whenever I call them out as attempting to beat the algorithm, it usually starts a flame war. ("It's hustle!" / "Everyone is doing it!")
That said, one of the startups I interned at, had a massive internal doc (and tools) on how exactly to game product hunt (which I believe was extremely effective) - The startup ran out of business and is no longer around, which is why I was trying to recreate that document + tool.