1) I'm not sure how this author can make the claim that John MacArthur is both a "hyper-Calvinist" and is "ecumenical" at the same time. They are mutually exclusive.
2) As far as Lordship Salvation, John MacArthur published some things on this topic a number of years ago for which he got re-soundly bashed. He has since retracted this view. However, retractions these days are not as easy as when Augustine retracted his works. This material flies out on the Internet and you'll spend the next 20 years saying you were wrong.
3) The reason John MacArthur was kicked off the BBN wasn't because of his views on Lordship Salvation, hyper-Calvinism, and the blood of Christ. The reason John MacArthur was kicked off the BBN was because he talked about election. There was an article on this some time back here but here is another link John MacArthur Gets Booted Off the Bible Broadcasting Network for Preaching the the Biblical Doctrine of Election Aug 23, 2004
While I will agree with you that the more you know what someone teaches and preaches the safer you are. However, it would be beneficial for this author to get his facts straight. His material is based upon out of date information and innuendos. Unfortunately, going to this author's webpage, I can't find his theological views on election of the saints. It would be nice to know. I know Spurgeon's and MacArthur's views.
I don't find that they are. For example, JM supports musicians in his church, or has music groups play at the college that he wouldn't agree with doctrinally, yet he would enjoy fellowship with them.