The boards job is not to cater to the whims of fans or make press releases, it's to make sure things are done properly in accordance with the institution they represent. It's 100% possible Rafael has been told he's fired, and the board are simply making sure everything is in order before an official announcement is made. That's how professional organisations work.
Again, we don't know the details of the contract, we don't know the complexities (but I assure you, it's not as simple as yelling "yer sacked!"). For all we know Moshiri may want to meet with Benitez in person - he is/was his man after all, his choice, and may want to do it man-to-man. There may be no severance clause in the contract, in which case Benitez may want his lawyers to go through it all first. There will be a number of people involved, either way. The board are under no obligation to rush out a press release at 11.45pm to satisfy fans, internet or not. Let's see what transpires tomorrow.