He's implying that using bcrypt (and other iterative hash functions like PBKDF2 and scrypt) raises the cost of mounting a dictionary attack compared to commonly

He's implying that using bcrypt (and other iterative hash functions like PBKDF2 and scrypt) raises the cost of mounting a dictionary attack compared to commonly-used and -recommended hash algorithms like SHA256. Which, uh, is an objectively verifiable fact.