Yes, it is an excellent article. You can't take that away from Randy Holmes-Farley.
My big objection to a lot of his writing is that it's really not geared to a beginner. They tend to be long involved articles, going into great detail. This is all great for people that are experienced and want to "know all" about the subject, but it is far beyond what most beginners can take in.
What's needed is about a two page summary up front, that tells people what the water parameters should be, and if they are out, what to do to correct them.
In the case of supplements, tell, in your opinion, which are useful, and which are questionable, and which you don't need. Most beginners need a cookbook approach. In other words, they need to be told what to do to get a reasonable system going, and not be snowed under by a lot of information they don't understand, and can't evaluate or apply it.