I don’t know how rare or widespread it is. My problem with the writer is they presented no evidence that it is widespread but passed judgement on “all these movements”.
It’s extremely widespread. The only reason we don’t know how much is IFB’s don’t keep records like Catholics did. They just ship the pastor off to the next church with glowing references and he’s “their problem”.
Fr. Malachi Martin, who was in a position to know, said this problem is in every religion on planet earth, as far as Christians go the Greek Orothodox have it the worst, but even then they are not the worst offenders on planet earth. The worst offenders are not even Christian.