Earlier quoted context omitted.
Not only do the receipts contradict the Reddit CEO, but even if they didn't, the Apollo dev is well within his rights to offer an ultimatum that either Reddit acquires his app, or he shuts it down. If he has enough leverage in that situation for Reddit to feel as if that's "blackmail," then it actually means that Reddit is the one blackmailing him with the pricing changes. On one hand they claim they need to increase…
It was the "go quiet" part, as in if they don't just buy him out he'll scream and cry to the public so they get really negative publicity on the API updates. To be clear, I don't think that's what he meant, but I think that's what the Reddit person thought was being said.
Joke was to offer the app for half the price if the pricing was legitimate, and keep the users.