By "reverse engineered" do you mean capable of disassembly and subject to comprehension? In other words, a surgeon is capable of disassembling a knee joint, and comprehending its components and its method of function. So is the knee joint something that can be "reverse engineered"?
If so, are you saying that everything that can be disassembled and comprehended (including, but obviously not limited to, a knee joint) is necessarily the product of deliberate design?