I agree, it is the right decision.
I have always believed that Frank Bruno is fundamentally too nice a person to be a boxer.
I remember years ago, he came to open a new gym near the school where my wife was Deputy Head, and she took her top junior class to meet him. She said that Frank was charming with all the staff, and took time to chat with the children, and was generally a lovely man.
I contrasted that with Mike Tyson when Bruno lost to him. It wasn;t hard to see why – Bruno was a gentleman who wanted to box Tyson into submission, Tyson was a street thug who wanted to kill Bruno and would have bitten his head off if it was in the rules – or even if it wasn’t!
Frank is well past an age where he could expect to be a decent opponent, he needs to stay retired and look after his mental health.