This does seem like it has the potential to get quite ugly if United and England knew about this before now and the press couldn't report it.
What was done by United, by England, by Southgate or Solskjaer to make sure it stopped? What was said or done to Greenwood, what help was the girl offered?
What did journalists know? Did they report everything they could, or were they overly cautious and allowed abuse to carry on.
England and Manchester United player abuses girlfriend is a big, horrible story, England and Manchester United knew player was abusing girlfriend and did nothing to stop it until the girl finally plucked up the courage to go public is a much worse/bigger story.
There's also going to be questions about the decision to sign Ronaldo with the Kathryn Mayorga leaked admission, and things like hosting Giggs in the director's box this season while he's awaiting trial for domestic abuse.
Solskjaer was in a lot of hot water in Norway in 2020 about how he signed an accused rapist and his agent Jim Solbakken was accused of helping him leave the country before a second trial.
All these things put together... none of it is definitive, it just looks bad for United with regards to violence against women being ignored/deemed unimportant.
I want to stress i'm not getting pious here, I think our club made a lot of big, probably worse, errors with the City player who is in prison right now, but I think if this story blows up, these things are going to get pulled into it.