I think what he's trying to say is that a random user can compile the program and say "Hey, i added X feature to bitcoin, try it!".
While in fact it had code that copies wallet.dat and send it to a remote server for someone else's use or directly sending the coins to a 'new' address.
No, I'm talking about the main version of bitcoin. You can't know that the person who compiled it didn't modify the code a bit just before doing so.