The article is about mixing singers on stage singing live in church meetings so a congregation can follow. There's obviously some overlap with mixing a track for a permanent record, in the same way there is some overlap between driving a car on the road and riding a bike on the road. But I wouldn't give the rider and the driver the same advice nor consider what they're doing as the same.
For starters, the actual music in much "worship" music is, while not irrelevant, very much relegated to second place with the emphasis on "relegated." The lead singer and message rules all. Instrumental prowess or invention is generally frowned upon {even if, sometimes, unconsciously} on the grounds that it takes attention away from God and the message of the song. That alone produces an entirely different mindset in the mind of the mixer because in music not of that kind, there are a number of other considerations. The lead vocal is important, but only as one part of a much larger and multifaceted picture. They may rule all, they may not.
As such, I found the article narrow and mono dimensional even though it carried some interesting points to file away in the back of the mind.
Also, use of the word "ultimate" in any title needs to regarded with much caution.