It’s easy to fake if you are part of YC. You think they would lose 1B+ potential revenue if the only thing they have to do is to change one database record that nobody except them is monitoring ?
They're not the only ones monitoring their own database.
it's pretty hard to unpublish something on the internet though. How many system do you think are consuming HN content? how many consume those? You can't un-ring a bell, so a simple social post is almost always discoverable in the future.