Honestly, I think nothing will come of this and they will be allowed to get away with it. Or at least the promoted team. If they let one get away, they can't then punish others so it's all or nothing and EFL don't have the backbone to stand up to the bigger clubs spending above their means.
They afterall, probably see these big clubs as a draw for viewers to watch the EFL leagues. Hence why they get the lions share of sky action.
All the clubs doing things the right way will be left questioning why bother doing things the right way when you can get away with murder to achieve the grand prize of promotion and a bottomless pit of money.