[I suggest that the listeners of that video I supplied at LINK listen on a bit further than the 3-min mark

]
What I believe he was saying in his video was,
more like:
the footnotes in many Bibles say,
...
most ancient authorities agree that the word [in v.9] is them or they...
[and]
...
most early manuscripts omit us in v.9 and read they and them instead of us in v.10.
(in either case, my understanding was that he is referring to the "manuscript evidence"... per the "footnotes" in many Bibles)
Then he gives explanation as to why this "footnote" information (
supplied in many Bibles) is not actually factual.
That starts close to the 3-min mark and following.
[as I understand it, he did not make reference to
the ECF; I tried looking up the same page of the writings of Chrysostom that I'd referred to just the other day (as you did), and found NOTHING that was written (or presented there) covering the Book of Revelation by him... for example]