I wish I could be more help, but the only thing I know from experience is that my mom took antacids constantly, and she had H.pylori give her multiple ulcers twice. So I know that's not the way to go because antacids create the perfect breeding ground for it.
I had acid reflux pretty bad for a while, and that was like he said too - actually a matter of too little stomach acid.
So... even though I can't speak to the specific questions you have, I can say that I've never come across anything Chris Kresser has said about GERD that was wrong when it came to myself and my mom. I can't speak for anyone else.