It is extremely unlikely that the virus was grown in a lab, because it's unlikely anyone has the technology to create a virus quite like this one.
I presume you're not a big fan of conspiracy theories - well, a big part of where they come from is the media doing something similar to what you're complaining about, stating what might be true, as unequivocally true. It would also be interesting to know how much of the polarization in society can be attributed to the fantasy world the media projects into people's minds using these techniques.
So what you said literally does not make sense. I think you are saying that there are long subsections of genetic sequences that are used as markers? But as you have not actually cited anything we only have a one sentence explanation of your understand of something. Long is ambiguous, as is not found in nature. Hell even markers can be vague.
It's impossible to prove that it was not grown in a lab, which is why the burden is to show that it _was_ grown in a lab. Until we have that, we shouldn't be sharing stories about how it _might_ have been grown in a lab.