There are a few things he completely misses. An AR10 FP is .076 dia, not quite sure how he plans to get it through a .065 hole.
I'm not sure if the guys porting the barrels just have 1 size drill bit and they use it for every barrel in the shop or not but it seems many of them have the same issues the guy talks about. Porting them the correct size fixes a lot of those problems.
Using super light carriers and buffers on off the shelf barrels exaggerate the problems but can be toned down with an Adj gas block. Custom barrels can be ported to work correct to begin with.