As OP had no intention of sharing the recording anywhere and her DH had done this before and she's cleaned up and obviously whatever she said had zero effect on his future behaviour, I think it was a perfectly reasonable and very creative thing to have done.
Now he's actually seen himself as a shambling, disgusting drunk he cannot minimise or normalise it, can he? It must have been a nasty shock, but surely he needs to be shocked into reality? Cleaning up - and I hope he did it thoroughly because adult male urine is rank when it's stale - will have given him a moment of pause.
He's angry at being made to look at the truth. He's angry because his problem is now undeniable. He's angry because it's preferable to being sorry. He's angry because he knows he had to change and he doesn't want to. He's angry because his enabler has become his confronter.
He's angry with OP because it's easier than being angry with himself.
When he stops being angry, it will be time for him to address what he's going to do to next. It's not for OP to decide, but you do get to decide whether it's worth carrying on in this relationship, OP.
You were generous to delete the recording. I would have been tempted to store a copy before deleting it from your phone, just in case he ever denied or minimised his conduct in future, and also as clear evidence of unreasonable behaviour for divorce purposes.
I think he owes the house a new kitchen, too!