Of course they are. Anyone who expected something different is unbelievable naive.
There is a provision in the law that they can withhold anything related to "national security", so they can basically filter at will. You can't claim something you'll never see not to falling under that provision...
One problem is that programming an FPGA is a rare skill. A lot of even good programmers simply don't get their heads around how they tick.
Coming from a digital hardware background, an FPGA was amazingly straightforward, so I'm one of the rare breeds who does both FPGAs and microprocessors.
Tell that to the people who think they will soon replace this expensive and complicated FPGA stuff with something running on a cheap MPU programmed by an intern. For thirty years now...
Just like laws make a murder a criminal.