Quote by twofishquant
The paper seems to be gooblegook. C_p is a derivative and can be be negative or nonexistent. He does a lot of equations based on the behavior of classical ideal monatomic gases, which I suppose merely shows that black holes are not made of classical ideal monatomic gasses.

C_p is not a mere derivative, but a physical quantity with determined properties. Your 'argument' could be reused to say that (4) "is a derivative and can be be negative or nonexistent", but it is difficult to believe someone would accept negative or nonexistent mass for a black hole or an imaginary speed of light or similar nonsense...
Effectively, nowhere he says or even suggests that black holes are made of "classical ideal monoatomic gasses". He uses the simple case of an ideal gas for illustrating the difference between c and C.