I don’t know anything but I can’t imagine they need specialists if it’s just a cosmetics job for a monument.

Or the whole "retired guy in his late 70s gives a quotation to aviation week" is a red herring intended for US adversaries, which seems like a fairly basic ruse, but might have been put together as a coordinated plan. It could have its own value of sending opposing nation state intelligence agencies and air defense people down a man-hour wasting dead end of investigating something that'll never happen.