It’s an overwrite since the original live-action interpretation isn’t coming back, at least not in the foreseeable future (unless the next “Supreme Court” decides that Star Trek should be period after all, and goes all Solo and/or Forrest Gump when portraying elements from TOS). Had DSC needed to extend “The Cage” segment with new dialogue and action, they would’ve of course remade it with the new cast to match DSC style, which has also been referenced on PIC.
The Star Trek production continuity is being revised all the time, and the latest version means matching DSC wherever the Talosians need to be depicted realistically (as opposed to comic art or animation, which can understandably vary between artists). When that changes, our hypotheses and theories will change accordingly.