it says here its not allowed but the referral link is on his website i think it doesnt break the rules.
4. No referral code (ref link) spam.
Its did not get removed because it does not directly link the referral links. The person who is going to click on that link posted by the OP of that thread Don Pedro Dinero is talking about will have to decide whether to click on the link provided on "that" site or not.
Since the referral links are not posted directly on bitcointalk it possibly wont get nuked/trashed.
Its shady I agree and would be frowned upon by most people. Still its the readers discretion what to click on and what not to.