It's right for you that this is over as he's clearly sadly too traumatised. It's not your job to fix him.
Trauma means the memory hasn't been processed and filed into your memories clearly labelled as "in the past" but is stuck and continually re-activated as if it were still happening. The brain can't tell that the trauma isn't happening again right now in the present. Traumatic experiences basically get stuck in a different part of the brain to your other memories.
There are techniques people with trauma can learn to help them cope with the experience of trauma intruding into the present, flashbacks, etc, but they don't stop them happening. If you realise you're having a flashback you can tell yourself it will pass or that it's not happening now. But sometimes flashbacks are so intense people completely disconnect from the present and have no awareness it isn't really happening right now. They may not even hear or see you.
Flashbacks aren't just visual, they can be auditory, physical, solely emotional (so you suddenly relive the fear you had in that moment in response to a trigger but without any other element of the memory) which can be harder to separate past from present (compared to visual) - what markers do you use to navigate that if you suddenly experience overwhelming terror and you don't know where it came from?
Hyper vigilance is also part of trauma. The brain is in overdrive monitoring the environment for threats. At a simple level as far as the brain is concerned the trauma is still active and therefore so is the threat, so it's trying to be protective.
he still blames the woman for being angry, rather than recognising he is seeing violent behaviour in normal emotions that other people are able to deal with and work through.
Untraumatised people get upset at being snapped at and tend to be appreciative of an apology. Nobody should have to just deal with someone snapping at them. That aside...
Obviously I can't know for sure but I think it's more likely that his brain genuinely interprets being snapped at as an active threat, and at the same time his trauma is being re-activated and replaying in his body in the present. Somebody that traumatised may never be able tolerate being snapped at without feeling unsafe and reliving their trauma.
Just like some veterans with PTSD are never able to cope with sudden/loud noises. Or an abused rescue animal who even years later when she trusts you and feels safe with you will still panic if you move your body suddenly.
Lots of people aren't that tuned in to their own tone and volume and body language, and may not even notice they are speaking or behaving differently or in a way that signals aggression, whereas traumatised people in a state of hyper vigilance will pick up on tiny changes in the people around them that might indicate a threat. Especially if someone lived with chronic abuse where it is likely that as part of their survival they had to learn to try and predict their abuser and respond to tiny changes. Some abusers develop subtle behavioural cues they can use in front of others to warn their victim they will be harmed later.
Living with trauma is a different world.
His trauma is not your fault. Trauma is a serious injury and can be utterly debilitating to try and live with.
It's also possible as pp have suggested he was just an abusive man using trauma as his excuse. Since you were drawn in by what you describe as lovebombing might not hurt for you to do the Freedom Programme to decide and to protect yourself before you date again.
Since you're out of the relationship and asking about trauma I figured I would respond from that POV.