That is an interesting remark. Digital zoom is a very important tool for reviewing security video so you can make sure you're seeing all the detail that has been captured. That is the same reason he digitally zooms in on sections of the camera videos when producing the YouTube video. Because otherwise the ability to see pixel-level details would be lost by YouTube's compression and the lack of clientside digital zoom.
What I meant by my comment is that OPTICAL zoom will beat DIGITAL zoom when you get beyond the realistic expectations of the focal length for a camera. We may get by with a little digital zoom in ideal conditions, but we certainly do not see Hollywood type clarity.
Digital zoom is good if the subject is within the IDENTIFY range and maybe the RECOGNIZE range of the camera and yes you might be able to pick up some additional details. But he continues to push beyond the reasonable digital zoom realities of these cameras especially at night.
So here is a digital zoom from the newest 4K/T camera, which is an incredible camera and gives great images when the subject is within the ideal IDENTIFY range, and yes you can digital zoom at that range to pick up some more detail, but at 110 feet away, DIGITAL zoom won't cut it:
Versus a 2MP varifocal that is OPTICALLY zoomed to the focal length for the IDENTIFY distance of 110 feet away:
Which one is better? I will take the 2MP all day (and night LOL).
And that is the intent of my comment. He should do the running man and standing test within the ideal IDENTIFY range of the camera for the focal length it has and not do a digital zoom. Let's see what the camera can do when it isn't pushed beyond its limits.
I do not know enough about the YouTube compression and what not, but I would expect that if it could be read when not digitally zoomed, it could probably be read with the YouTube compression.