this stuff is supposed to produce less build up of deposits on the DPF caused by the chemical reaction of the DEF fluid
I think you're confusing the DPF with the SCR cat. The DEF injector is behind the DPF but in front of the SCR cat. So DEF can't possibly cause deposits in the DPF, but it could conceivably do so in the SCR cat itself.
Now DEF has historically been nothing but purified water and urea. In fact, I'm pretty sure the original ISO 22241:2006 standard didn't allow for any other ingredients. That meant that all DEF was basically equal, at least at the time of manufacture. Of course storage conditions and impurities introduced during transport and handling could affect it.
Now doing some digging, it seems Peak is claiming they use a "proprietary additive package", and the original ISO 22241:2006 has been withdrawn and replaced by a 2019 version....
This makes me wonder whether DEF makers managed to talk ISO into allowing some minuscule amount of mystery substance in the product to allow them to make marketing-hype claims? "My DEF is better than your DEF!" Yeah, sure.