On the other hand, existence of this conspiracy has been used to shut down perfectly reasonable discussion around a less outlandish lab leak for months.

Even in this post opponents of the lab leak theory are still bringing up this bioweapons conspiracy - but I can't see a single lab leak proponent suggesting it's an engineered bioweapon.

The issue is the existence of this outlandish fringe theory was used to censor all reasonable discussion on the lab leak.