I don't feel the skepticism was towards the method more so towards his staunch hatred of stir plates.
That's how I felt, too. I mean, I knew that some variation of 'SNS' worked because when I started making starters, it was Charlie P style back in the day - a quart starter in a gallon jug that I shook the crap out of initially. I think Charlie mentioned letting it ferment out, then decanting . Maybe not. But often, from not making the starter soon enough by Charlie's method, I pitched at high krausen and it worked great. But regardless, I made tons of good beer with a stir plate afterward, too.