Well, all I can say is I watched it on my 43" smart TV and I had no problems to understand the content (even though yes, a little blurry menus etc.). BTW the best tutorial I’ve ever seen!
Yes it’s probably just about doable, but I don’t see any harm in asking Steinberg if they have a proper hi-res version of this excellent tutorial which they could supply us with.
Opening a support ticket would be the only way to be certain your question gets to someone who could actually answer- they can’t read every individual post on the forum.
Anyway, one video out of like hundreds seems like an outlier- and the info is still available as has been pointed out.