Obviously I don't know why your child felt no contact was best.
I can only talk of my own experience of going no contact with my dad.
Both myself and my sister did many years back.
He sent plenty of messages sounding very similar to yours post. Asking why he should put up with gaslighting. How it was affecting him and his mental state. He then went on to blame the abuse he gave on others and sent messages saying we had both misremembered the past and it was not him but x. He then tried blaming our mum for how he was too.
Through it all. He was the victim according to his messages and his conversations with family.
Not once did he acknowledge the pain he caused me and my sister. He was threatening with violence and homelessness throughout our childhoods. He would constantly tell my sister she was disgusting and fat even when she was below a size 8.
He abused us in other ways too and had the police involved.
He beat me with a belt until I bled. But worse than that was telling me it was coming and when so I had to wait and go to school knowing that night I was going to be beaten.
My earliest memory of my sister is me giving her my teddy when she was a baby so she would remember me because I was told I wasnt wanted and had to go find somewhere else to live. I was four.
But none of that was acknowledged when we cut contact. It was all messages about gaslighting and woe is me.
He died a couple of years ago now. We were called by the hospital as his next of kin. He was still on the ward. It was christmas and he still had a cracker on the table next to his untouched christmas dinner. We pulled the cracker and walked away.
We told the family, all those who kept telling us to get back in contact and how we were being horrible and not thinking of him.
None of them cared He had passed. Turns out he had lent money to most of them and used that to put pressure on them to pass those messages on.
We went to his house, our old childhood home. The next door neighbour was still the local vicar from when we were kids. We knocked on her door to let her know. She said she suspected when she hadn't seen him for a few weeks. But she didnt want to knock on his door just in case he was alive as then she would have to talk to him.
Hopefully that gives an idea on how deluded he was thinking himself as victim.
If you want to have an impact with your child. Acknowledge whatever it is that caused no contact. Do not try for further contact. Just acknowledge fully and apologise and leave it at that. To me that is the only thing that could possibly end in some form of contact or not.