They are not separated.
They will be apart for at most two days, just as they were apart when Harry came for his court case.
Strategically, this the best outcome for them.
There won't be massive headlines hounding harry for "snubbing" his father.
And equally, there won't be headlines scrutinising Meghan's every move, body language experts interpreting her every gesture. She gets to protect herself from all that, and Harry gets to be there for his father's big day. The royal family is big on appearances: it maters that he is there because it would have been a huge embarrassment for Charles not to have his son at his own Coronation.
The biggest loser here is the press, because they have been deprived of their lucrative Meghan clicks. And the Royal Rota who have been denied hours of pontificating over her every move.
Still you can expect ACRES of column inches over the next few days crowing about his its a good thing she won't be there. Bad as that is, it would have been worse had she come.