Newcastle are absolutely dropping the ball moving so slowly this summer. Only one senior signing in and they're asking for so much cheddar they haven't managed to move out any of the dead weight to help the wage bill. I get they're petrified of financial fair play, but they need players with the team and in training now, not at the end of the window. They're going to have tons more games and will have to be able to field several starting squads. And they still don't have a first-choice left back, much as I love BDB. This slow as molasses, careful approach is going to hurt the team.
All that said, the FFP fears are very real. The Prem and big 6 hate them so much that one atom of a toenail over FFP and they will be crushed with penalties. Doesn't apply to the rest of the big 6, of course--just ask Man City lol--but Newcastle, they would crucify.