am I missing something here? the attacker still only needs to know the pepper to brute force all the passwords with this scheme. Since the pepper is determinist

am I missing something here? the attacker still only needs to know the pepper to brute force all the passwords with this scheme. Since the pepper is deterministic, and especially with md5 which is already extraordinarily quick to reverse, the attacker can just take md5(pepper) then do the extremely quick operation of the hash extension md5(password)