It is very common for alcoholics to loop back months or years later with an idea of resuming a relationship. Very common.
If you have been no contact, then you cannot know for sure he is actually sober. This could be a fish line he's thrown out to you, and I would be very cautious.
And if he is sober.....I'd still be cautious. He is still in what could be called early sobriety. And his judgment and particularly his emotional maturity may not be reliable.
I have never been contacted by my exAH wanting to make an amends. But I feel no curiosity about him nor do I want any kind of conversation that seems "intimate" with someone I am certain I would not trust, no matter what he said to open a door with me. And I feel no obligation at all to hear anything he might have to say.
If you feel you need to hear an amends and want to risk the contact, then open that door only for you. You owe him nothing.