The headline is literally true in a certain, non-colloquial usage of the term "most likely". It's is also true to claim that Covid-19 was more likely not because of a lab leak. That's what "low confidence" means. If you could bet at even odds that it was a lab leak, and the bet could be settled by some omniscient force, you'd be a fool to take the bet.

The fact the chances of it being a lab leak are so high does mean something, and I'd like to see those odds be lower for any future scenario, but to think that implies we can say with confidence "that's what happened" is, as was clearly stated, wrong.