The quote also doesn't indicate the SpaceX team is being "brought in to overhaul FAA systems", that seems like a big mistake if that tweet is all they are basing it on. The tweet says the FAA is tasked with overhauling their ATC system, and people from SpaceX are visiting to share ideas, and it seems to include an open invitation to others to do the same.

Political pettiness, and speculation about whether Musk got some special favor or advantage that would not be available to other companies aside, it doesn't seem like a bad idea to get cross-pollination and share ideas with other organizations and fields. SpaceX may not know much about ATC but they probably do know something about monitoring and control and collision avoidance in rockets and satellites.