Yeah, it is wrong to claim it was certainly a lab leak when there is little evidence. However, it is also wrong to claim it certainly wasn't a leak for that same reason. Let's just hope the truth is found, and we learn from it.
It's hard to do, but simply being able to say "I was wrong" or "I messed up" would make the world a better place. This is actually something I've been working on.
When I'm wrong, I try to have the grace and maturity to say "I got this wrong. I got this wrong for reasons X, Y, and Z. Here is what I can do to prevent or mitigate X, Y, and Z in the future." I think an answer of that form builds credibility. People who see my mea culpa may gain confidence that I've learned my lesson and will do better in the future. If, instead, I were to say "A lot of people got this wrong. These people I hate were wrong too - kind of, I think they were wrong, they are pretty dumb. Anyway - a lot of people were wrong on this..." then that probably wouldn't inspire much confidence that I had learned my lesson. I read this article as more like the latter rather than the former.