Key word being "mostly" in that quote. If you want to hear his description regarding DNA vaccines, just read the next paragraph of the article - quoted below:

Key word being "mostly" in that quote. If you want to hear his description regarding DNA vaccines, just read the next paragraph of the article - quoted below: “The DNA [in DNA vaccines] does not integrate into the cell nucleus so this isn’t genetic modification - if the cells divide they will only include your natural DNA. But this approach is incredibly promising for COVID because it can be scaled up very quickly, and is very versatile - it is easy to synthetically produce DNA sequences that match the required bits of viral genetic code.”