The main page with the NODD stuff on is this one:
https://www.tvark.org/?page=49&subpage=Miscellaneous
Click on the pictures and the detailed descriptions on the pictures mentions both "NODD" and "Nexus Orthicon Display Device" and claims that was the real name for the device and it wasn't actually called Noddy.
I seem to remember it was either the MHP mailing list or the Mausoleum Club tried to work out where the NODD term had come from, and they seemed to trace it back to TV Forum- certainly nobody on either of those places who'd worked for the BBC at the time had ever come across the term "NODD", and it's not in any BBC documents. This was a long time ago (around the mid-00s), so that might be why you remember the "NODD" term always kicking about. Possibly it did originate before TVF and merely got repeated there, but that was the earliest mention of it they could find.
Similar was the case with the term "holding slide"- also seemingly escaped from the blue place. Though in that case, it's a genuine term being applied incorrectly than something being made up entirely. I think it was used by some ITV companies to refer to certain slides which were displayed for long periods (interval, breakdown etc.) rather than all slides as a whole which is how it's come to be used.
It might not be the biggest thing, but there's far too many cases thought history where even minor factual errors get repeated so many times they become treated as 100% fact after a while and the real facts get forgotten or muddied. It might not be the biggest or most important thing if future generations looking into TV presentation history think the "NODD" thing was correct, but I think most of us would prefer the correct information get preserved for the future. After all, one of the reasons people got so frustrated with cwilliams and his videos was because there were several occasions of researchers thinking his videos were the real thing and work went out with factual errors as a result.