There are definitely people saying that covid was an engineered bioweapon and the people saying that have a huge overlap with the people saying that it was a lab leak. Conspiracy theorists need a villain with a plan to make sense of the work and that’s why the lab leak theory keeps coming up.
Back to an earlier point you made, how is it relevant that it was an accidental lab leak anymore? It’s China, they’ve either made better safe guards against possible break outs or made superficial changes for appearances. The international community can’t punish them for an accident that also hurt themselves. Hell, we can’t seem to keep their coast guard from ramming other ships.