I doubt that will go anywhere. 1M out of 25M is only 4%. And the $1M was split among multiple people, over a period of years apparently. Even if it was claimed that 100% would go towards the wall, charities are still allowed to pay themselves. It can be argued that those administrative costs are part of building the wall.
Other charities take much more. The 'Kids Wish Network' operates legally and only gives about 12% of what it brings in.
The 'Kids Wish Network' doesn't claim that 100% of their expenses go to their programs. They didn't claim that one of their founders wouldn't get paid, then make sham invoices to pay them in secret.
The problem isn't that Steve Bannon and Brian Kolfage got paid, the problem is they promised that they wouldn't get paid, then sneakily did it any way.
The problem isn't that "only" 4% of the money went to people, it's that 4% wen't to people that they promised wouldn't get ANY.
They can certainly argue those were administrative costs, they can tell the Judge that during their trial.