I think “plainly” should substitute for allegedly in these cases. Fine whatever the government hasn’t yet deemed whether they will face any official sanction, but it’s not like even the court is the final arbiter of actual guilt or innocence—there are all kinds of reasons a person might be found guilty or not that have nothing to do with the truth. Someone who pleas a 20 year sentence down to 6 months probation is “guilty” of nothing but cutting their losses, yet we don’t have to use “allegedly” about them.
They did it whether they ever even faces charges or not. So they are plainly guilty.