Plenty of sexual abusers are thought to be "great" by outsiders. That means nothing.
What it boils down to is it's likely your husband is actually suffering from trauma and won't receive appropriate treatment/support to heal from that if it's kept secret.
Dissociation to survive sexual abuse is a normal response to protect oneself. Once traumatised it can then become problematic. It makes perfect sense that somebody who experienced great trauma as a child would respond and struggle as you're outlining here.
Even with the memories shut away doesn't mean the feelings associated with the memories won't continue to be activated by external triggers in the future.
If he doesn't know he's experiencing totally normal trauma reactions he can't be kind to himself, can't take care of himself, and ultimately is limited in how much he can really heal beyond calming down each bad episode as it arises. But without necessarily ever reducing how often they arise because the underlying cause hasn't been addressed. It's a little like if someone broke their leg but you just loaded them up on painkillers and gave them a wheelchair to get around but left them with an open fracture.
I appreciate your dilemma, and it needs dealing with gently, but it's a critical piece of his jigsaw that potentially enables more appropriate and targeted care for trauma. He may never be ready to deal with it, but if he's working with professionals in a way where you could speak to them I'd consider it, even if just to say you're concerned about supporting him.
I wouldn't expect him to say "oh, yes, you're right, I was abused" if you ask him. Denial is protective. And children can take a long time to ever understand what happened to them as abuse. But you could gently share what you were told with reassurance it doesn't change how you see him and no questioning. Just perhaps "I wonder if this is an extra piece of your jigsaw puzzle that could help you recover"...