I'm pretty sure that the commercial injections from Kosmos or Butcher BBQ or other people, contain phosphates. Competitors do a lot in comps that won't work in the backyard.
My thinking, there are three distinct worlds in the barbecue universe ...... backyard, comps, and bbq joints. And there's not much overlap between the three. I wish I could make a Venn Diagram to illustrate that, but I'm not much on this tech stuff.
IDK how much the backyard guy can gain from the other two worlds. I pay attention to them, but heavily filter what they do.