These two things are vastly different: A) All the experts agree that covid comes from a wuhan lab B) Experts have not ruled out a lab leak

Pointing out such a difference is not being pedantic, and in fact is hugely important

The post said "all the experts are saying may actually be true". The "may" (not "is"!) there is pretty key in making the meaning a lot closer to your (B) than anything like your (A)... Did that comment get edited after yours? Because it seems like you are arguing against a strawman, not what was actually said.

But that is not the difference here. The original post said "Something [meaning the lab leak theory] all the experts are saying may actually be true". This is somewhere in between your A and B and at least to me sounds closer to B than A, as "may actually be true" is more of an acknowledgment of possibility than an assertion of probability. It's definitely not a statement of certainty.

But the statement in question was not "all experts agree that covid comes from a wuhan lab", it is "all experts agree that covid could come from a wuhan lab". That's still unlikely to be 100% accurate, but your version A is a complete misrepresentation.