The idea that HN "buries stories about [YC] investments" is one some people assume must be true—as you did, for example, in your use of the word 'fact' above. But the truth is the opposite. When stories are negative about YC or YC-funded companies, we moderate them less, not more, than we otherwise would. I've posted about this plenty of times, e.g. recently at https://news.ycombinator.com/item?id=13861389.
For example, consider the current post. This is not a good HN story, because it doesn't describe anything of intellectual interest. It also has a baity and misleading title, which breaks the rules at https://news.ycombinator.com/newsguidelines.html. But we haven't penalized it, and we haven't replaced the title other than to put quotation marks around "bribes", in response to a user's objection. Intervening less in such cases, even at the expense of HN's quality, is the price we pay for being able to answer comments like yours and the GP's in good faith.