Generally: While suppressed memory of trauma exists, the vast majority of people are aware of trauma and there is no evidence suggesting otherwise. And there is clear evidence that lots of mentally well people get addicted as well, so just claiming "it's always some underlying condition" is probably not a great idea. It can, often even, be, sure. But that doesn't make it mandatory and especially doesn't allow the "I struggle with addiction, so there _must_ have been a problem beforehand" conclusion.
So honestly, I'd just not search any deeper to not risk inducing any false memories.
It is problematic, but not in the way that you think. While memories can be suggestively altered or created by questioning, the evidence for doing so for traumatic childhood sexual abuse is anecdotal and those anecdotes were pretty heavily cherry picked by the clearly biased FMSF, which was run as a support and advocacy group for parents accused of abuse.
That said, my understanding is that in general, dwelling on traumatizing experiences isn't beneficial to recovery. There are times they may need to be confronted and processed, but generally if it isn't causing a problem, don't go digging it up and spending a lot of time thinking about it unnecessarily.
Like the comment above said, many “repressed memories” are actually false memories or, in rare cases, false stories that get constructed and encouraged by a misleading therapist who is convinced that some repressed memory exists and pushes too hard to get the patient to “remember” something. When the only way to satisfy the other party is to come up with a story, many people will eventually come up with a story and even believe it themselves.
The same thing happens with false confessions.
Don't worry about it. The trauma diagnosis has been ludicrously poor at treating addiction.
From what I've read, it performs worse than placebos, random chance, etc.
For treatment of substance abuse, therapy is literally at the bottom of the performance chart, below things like hypnotism, alternative medicines and plain old prayer.
I'm addicted to sugar. I have some trauma now? What trauma? My life has been relatively smooth sailing. You're right, this is just a way of creating the "need" for "therapy".
I generally engage more in my own flavor of addictions (caffeine, social media, workaholism) when I am more overwhelmed, understanding that I do this and why… was helpful.
The clarity usually comes in retrospect for me.