mRNA cannot rewrite or change DNA. It is analogous to the screen in the T-shirt silk-screening process. If you aren't familiar with it...
mRNA is like the part created in step #1. It is a kind of copy of the original transparency. The screen cannot change the original. It is just an intermediary to transfer the image to the T-shirt.
I think the misunderstanding of the speaker in the video is perhaps caused by him trying to simplify the description, and not being successful. Though, I don't know if my analogy will be much better. But I am sure that GabNews should be able to find experts that they trust that can help them understand and issue a retraction.
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