Yes. Compartmentalization is the official name. the memories are there. You just locked them away in a place your subconscious mind doesn't want you to find. In time, they will come back. If you want them to.
But if there is nothing really there worth remembering, why go digging them up.
I have few real memories of the last 20 years. I'm not saying it was a black out. I'm only suggesting many people in our circumstances box up the bad times and file them away.
My father, who doesn't live with an alcoholic has a phenomenal memory. I will start talking about something from years ago and he has almost perfect recall. As we discuss the event, I will then remember it just as clear. It's just that I can't access the files.
Just one more of the things those of us living with alcoholics share.