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The impression I got from Wikipedia reading about this (suzetrigine) is that it’s not addictive because it acts on peripheral nerves and not directly in your brain

Given how scared people are of "addiction" the seller certainly would like that narrative and it might make sense from a withdrawal perspective. Which in turn has an effect on how addictive a drug is to a very large degree.

Yeah, the lack of addictiveness was one used to promote the spiffy new drug heroine over the addictive morphine.

I am very curious about these theories, can you refer them?

Operant conditioning https://en.wikipedia.org/wiki/Operant_conditioning

There are also lots of studies indicating that the speed of action of a drug is important for addiction. Which essentially boils down to the fact that the brain (beeing effected by operant conditioning) needs a drug response that is sufficiently noticeable to be connected to the action of taking the drug.