If you think about how metrics works, they probably had friendly fraud pumping their numbers -- think about them counting bots as new users when in fact it was just bots. Zuck sells Nov'2021 because he knows this info (insider trading works this way), earnings come out and news is released from the prior quarter.
Zuck and other executives sell on a schedule right? I agree this is plausible but your second sentence sort of implies he in short time frame defrauding investors by selling before releasing numbers. Not sure that is the case, its the same as Elon Musk asking Twitter if he should sell but already had scheduled sales disclosed prior.
