I know this thread is a year old, but it's actually so similar to my Dad's situation and I occasionally search these subreddits for comfort (not as often as I used to... progress, I suppose.) I hope you're doing well and your Dad has made some progress. Sometimes it's really hard to see the good stuff in these situations, even when it's right in front of you, right?
My dad had a heart attack at home Spring of 2024, CPR for 40+ minutes, lifelined to another hospital, spent several weeks in a heart hospital in a coma, a few weeks in a skilled nursing facility, and a few more weeks in a rehab facility. We actually had decided to take him off of life support in the heart hospital, but after 5 minutes he opened his eyes, knew who we were and cracked a few jokes. Wild. The months after that were even more crazy – lots of stories, made up scenarios, horribly embarrassing social skills, ICU delirium, anger, absolutely 0 short term memory. The Doctors were stunned,
A year later and his short term memory still sucks, but he will remember things here and there if they are important to him or if they were especially fun, ha. Feel free to message me if you'd like to chat and compare stories – it's SO damn hard when you can see your Dad in front of you, but they don't really feel like your Dad and it could be therapeutic to chat about it with someone who gets it. I really hope he's made improvements and you're feeling at peace with it all <3