You misread that - there is no claim that delta was initially released by a lab, rather a the known fact that a lab studying delta had an accident. Read the links the author provided.

The claim wasn’t that Delta originated from a lab leak but rather that Delta happened to leak from a lab (after the point that it existed in the wild). Additionally, the phylogenetic points from the article would suggest that Delta is of natural origin

She, and yes, she does need to go back over that sentence and clarify it, because it does read that way.

Thank you, fixed it.

He doesn't claim the origin of Delta was a lab leak. He claims Delta leaked from a lab in Taiwan.

S/he clarified it now.

"[Edited, 5 Jan 2021, to add: Many people have been confused about the statement about delta, so I must have worded it poorly. I’m not saying delta originated in a lab leak. I’m saying delta escaped from a lab late in 2021 where it was being used in research. It’s an example of a research-related lab leak.]"