That argument is utterly unconvincing, as you've conveniently left out the millions of years of "training" and "fine tuning" that has occurred through the evolutionary process.
There's some reasons to suspect this is at least partially true, but to what extent is unknown and contraversial.
It doesn't say anything about that knowledge being precoded.
The fact that human brains are capable of learning things that animal brains cannot, is a clear indicator that it is already "trained" to a significant degree.
Human "learning" seems to be much more analogous to "fine tuning and memory storage/retrieval", than actual training.
Why can't a macaque teach a calculus class? Why can't its "empty" brain be taught to do something like that?