1) He says you should delete your facebook account. It's too late, the data is already there. Deleting does nothing.
2) "By company-ending I mean Facebook would never recover from the consequences of so much user data being dumped online for all to see" utter conjecture. there are petabytes of data, dumping that online is hard. Exfiltrating unnoticed is hard.
3) "This is potentially so bad that it could be called the Great Facebook Hack of 2018. But again, we don't know how much stuff was stolen. Yet." Again conjecture. This could be called the "great facebook spotted a hack on two account and stopped it before it got bad"
This is pointless punditry from someone who literally is nothing to do with facebook, has no contact with people close to the matter, and is just guessing.
yes, that much data in someone's hands is bad, but so is google, and the legion of databrokers and ad spinner.