It is definitely not an off-the-reservation suggestion that maybe it escaped from the Wuhan lab. It was all very well when they were making confident pronouncements like “oh yeah it originated in this wet market” and “probably from a pangolin”, but now things have reverted back to pure ASCII shrug emoji we should reconsider.
The lab is not merely in Wuhan, it’s just around the corner from the wet market where the outbreak was first detected (edit: not as close as I thought, it’s about 10 miles away). Under the supposition that it escaped from the lab, chances are extremely high that it would first be detected in that area. Under the theory it’s a natural outbreak, it’s a moderately remarkable coincidence. Wuhan has something like 2.8% of the population of the top-50 cities in China, all of which have over 2 million people. It’s also 1,000 miles away from the presumed source of the virus, meaning the caves in Yunnan province. What are the chances a naturally occurring outbreak would be detected not merely in Wuhan, but in close proximity to the only BSL-4 lab in China, where they are known to study coronaviruses? One in several hundred, maybe?
In a vacuum, a novel coronavirus outbreak is much likelier to have originated naturally than in a lab mishap. Several hundred times likelier? Not so sure about that.