I find the need for a conviction a strange take personally. There are countless cases of people committing a crime and not getting convicted for it. If your whole moral compass is based on complete faith in the justice system, then fair enough, but it's not a stance I can agree with. The audio is there for everyone to hear. Any 'we don't know what happened before/after' is just nonsense. He beat her up. If there was any evidence suggesting it was false allegations/it wasn't him in the audio, it would have come to light a long time ago. She took him back like many domestic abuse victims do. Especially when said person can have a huge influence on your 'status' or 'quality of life'.
He doesn't have to be convicted of a crime to be fired from a job. All of us would be fired if an audio of that came to light and was sent to our employers. Also, if this was Diego Dalot/Harry Maguire/a youth team player, they would be got rid of. They're holding on to him because he is a financial asset. So, now their ethics lie entirely on financial gain which is deplorable for an institution like Manchester United.
I wouldn't care if he was convicted of the crime or not, if City were signing him, I'd be done with attending until he left/the person who made that decision had been forced out.