"And to be honest, i wonder about the existence of any “pure” church singing tradition at this point in general"

With the thousands of black churches in the USA right now, he's basically questioning whether any of them haven't given in and started catering to secular tastes in music. This is an idiotic and ignorant statement at best and you're a complete bumbling idiot for suggesting he's right. I don't see how any sane person could take this statement seriously.

He's way off in concluding that almost all churches are probably borrowing from the secular world. If he said "too many are" than maybe we have a real discussion. He's flat out wrong and you are too.