What are you even talking about? The AZ and J&J vaccines always involved the nucleus - that's how they are designed. There's no "known possibility" about it - that's the *only* way those vaccines function and the way they were *always* described as functioning from the very beginning. They send a DNA strand into the nucleus which then transcribes the mRNA and sends out of the nucleus into the cell cytoplasm to the ribosomes with the instructions to produce the spike proteins.
Another pretend "new" discovery to refute an argument that was never made about these particular vaccines.
So the JnJ and AZ vaccines are gene therapy approaches then, right?