I don't think the post meant that. Remember, the Eastern Orthodox church is out there, and is not Catholic. But more to the point, even as late as the 1960s, the Anglican and Methodist Episcopal churches, to name two I am familiar with, were holding to the "apostolic faith" mentioned at every service in the Apostle's Creed. Then the Youth Rebellion, The Pill, and The Sexual Revolution started to take over U.S. Protestantism and its seminaries.
The part where he says...
The privatized DIY American model is hopelessly inadequate and defective.
...he is just being nasty. Like some of my Catholic friends, he thinks that the cause of all the problems in the world is the Protestant reformation which itself was inspired by Satan. He lumps all non-Catholic Christians together as "Protestants" and gives us the code name "the privatized DIY American model". I bet Romulus would say that Obama and I are the same religion because neither of us are Catholics yet we both claim to be Christians.
I am pretty well versed in Catholic bigotry toward Christians. I have seen quite a bit.
The changes you mention in the Protestant church denominations are why I attend an Evangelical church. We are not part of any top down hierarchy. We are however affiliated with several other Evangelical churches which teach a similar Bible based message. If my church were to change and start preaching an extra-biblical message (such as the elevation and worship of mortal men), I would simply leave and find another church which teaches the word of God.