Note Facebook has previously explicitly banned posts "falsely claiming the virus is man-made". Source: https://www.npr.org/2021/02/08/965390755/facebook-widens-ban...
" Claims that it was created by an individual, government, or country
Excluding claims that it was studied in, came from, or leaked from a lab without specifically calling it man-made"
So discussing possibility of a lab leak is not a problem, it's the deliberate bioweapon aspect that they're banning. "The goal of this policy is to remove common viral hoaxes that have been repeatedly debunked by independent fact-checkers."Hidden camera investigation of Facebook moderators (ie fact checkers)