This smells to me more like one member of the team is salty about not getting an expected yearly bonus and is now claiming the rest of the team received one due to foul play.
When payroll is reviewed, I have no doubt there will be recent changes to pay for 6/7 of the team-- which will give this source enough credibility to not dismiss the rest of their allegations.
I'm not even commenting on whether the lab-leak theory itself is valid, but I do think this particular event is someone playing at shenanigans. When the only tool in your box is a shit-stirring stick...