Here are the verifiable facts:
1. The Wuhan virology lab 1 block from the Wuhan wet market where one of the first clusters was traced to, was studying naturally occurring coronaviruses and their transmissibility to humans.
2. The lead scientist from the project is nowhere to be found. The CCP insists their are fine, but can't produce them to verify this claim.
This is by no means indisputable evidence, but there is definitely some evidence. Based on how the CCP usually conducts themselves, do you really think they would ever admit they accidentally unleashed a deadly contagion on the world?
No credible source is claiming it was intentional or any sort of engineered virus, but merely an accidental release (self infection) of a naturally occurring pathogen.