That is not evidence! It is at best a coincidence. An even stronger coincidence would be that this lab had a genotypically similar virus stored prior to its detection. But even that is not evidence of release; it is just a stronger hypothesis.

If I was near a bank robbery at the time of occurrence, it does not count as evidence that I did it. Not even if I have a history of robbing banks. It must be combined with other, stronger evidence (I was inside the bank, my fingerprints were there, I was caught on camera) to build a case.