I haven't watched all of it yet. I surely respect the skill, but just like a trapeze act, throwing dough is not what I'm here for.
He did mention that he's using "his" flour. I don't know how long CM has been making a signature flour for him. They indicate that it spent some years in development, and i don't know what the timeline was.
He adds LDMP to this batch, but the CM signature flour has some already. *shrug*. IT's good flour. I liked the 5 pounds of it that i used. But to get more i would have to either drive 100 miles, or figure out when the next time my nephew or someone else i know is driving to Logan and back, or pay shipping, and for my pizza needs it is not *that much better than bread flour i can get at the grocery store.
I think it's weird to refer to malt as "derivative of barley" and "more natural" -- more natural than synthesized enzymes i guess. It *is barley. What bakers refer to as "sprouted" grain, brewers refer to as "malted" grain. Same thing. Different malted grains have different diastatic power, expressed in degrees lintner. 2-row barley malt is very strong. Oat malt is very weak. There's a lot in-between. Malt flour has to be milled at a low temperature to avoid destroying the enzymes, which is why you can also get malt flour that isn't diastatic.
I'm sure that there are dough doctor posts on the subject but yeah late addition of flour does allow the gluten matrix to get started better and results in a stronger matrix, which you may or may not want in your pizza.
Also on the subject of how much it hurts the yeast to have the salt dumped into the mixer with the water and yeast. My experience is, not a ton if you go ahead and start adding flour pretty soon.