I watched some of this earlier videos, and still dip in every now and then when one of the build videos grabs my interest. As someone who's not at all hands-on with maintenance, I found it quite interesting and that made me sit up and take notice all the more than there was something of a YouTube spat going on about what he does and how much of it is incorrect.
I don't really care one way or the other. The rebutter is quite an obnoxious person, who may or may not be correct. Del is clearly trying to build something (he's put a huge amount of effort into it) and has done to the point where he's convinced over 200 people to support him on Patreon. It might well be built on shaky foundations, but I can understand why he'd try and protect it.
Life's too short either way. Watch it and enjoy or don't.