I agree with the flap argument itself, but
1) HTC have no obligation to share their data, data sources, or data interpretation
1b) They're not likely to share it because it's private and would lead people to try and pick it apart > you give people an inch and they'll want a mile, and then you have to justify yourself and your methods. It's just not worth the hassle.
1c) They won't share it or give you that inch for sure if you try to get it out of them by force, esp if it's done by accusing (implicit or explicit) them of being unfair, etc.
2) If you want to go somewhere with this, you need to work out the whole of your argument. E.G. Show your math from A to Z - how the structure meets with and can bear [a,b,c,d,...] amount of aerodynamic force at [s,t,u,v,...] speeds (not just dimensional rules of thumbs), as well as it being allowed by the appropriate specific documents. You can't just say you have those docs.. You have to show the full details, to make a real solid case.