Along those lines I think an interesting conversation would be, what was done and why was it done? Any system, even highly refined ones, are not perfect and innovation yields small gains - but gains nonetheless. Realistically a fuel car makes more power than it can use and the trick to getting it down the track lies in power management, so making more power isn't really necessary. I have no information that this is what or why, just thinking out loud... but what if they modified the hat to provide better fuel/air distribution? While that could be construed as something to increase power, it also could be argued that it helps the longevity of the engine (as in no ka-boom) if it prevents wet or lean cylinders. After all, making it to the finish line under power is a good way to get a win - although not a competitive advantage unless no one else can do it.
I do agree that rules are rules however, so if JFR wanted a change to the hats they needed to go though the proper channels. And that's why they got spanked.