Yes, it is. Questions about its origin ≠ proof of it coming from a lab. As far as I can tell the guy you cited is the only one that says he found that particular marker/indicator/whatever, other credible folks have questioned where it might have originated but as far as I know have not claimed to have found proof it came from a lab, intentional or not.
Probably naturally as the vast majority of experts think at this point. It fits in with past epidemics and pandemics and its origins don't seem all that fishy to me, so to speak. I have an open mind though, if
credible evidence comes to light showing otherwise then I'm more than willing to reassess but there hasn't yet so I haven't.
Of course we would never publicly accuse a country of doing something using what we have found out from classified means but keeping many of the details secret. Perish the thought! We certainly wouldn't do anything like:
Just to name a few. Naw, we wouldn't do any of that.
And certainly the President, who has never declassified anything himself to prove a point, would just sit on such intel even though it would prove that China was wholly and completely responsible for the virus thus validating one of his central campaign themes. Nope, wouldn't happen.
For a supposedly intelligent guy you don't seem to know how intelligence often works.
Not only that, if a non-intelligence agency found something suspicious they possibly would not be bound by the same classification restraints. And that isn't counting a public or private US laboratory, of which there are scores of world-class ones. Or any number of very competent foreign government and non-governmental agencies along with numerous laboratories around the world. All of these entities and their personnel have a very keen interest in finding out the origins of the virus. How many of them have declared it to come from a lab, intentional or not? Again, almost everyone has questions on the origin of the virus but no credible agency or lab have said it came from a lab, intentional or not, or that it was man-made/altered.