Pickleball Rules Refresher: Service ettiquette

Last week at Pickleball I was playing doubles against a player who consistently served the ball to me before I was even ready. He said that as long as he was ready, then he could serve. Is this true?
According to the International Federation of Pickleball rules it states:

The 10-Second Rule. The “10-second rule” applies to both server and receiver, each of whom is allowed up to 10 seconds after the score is called to serve or be ready to receive. It is the server’s responsibility to look and be certain that the receiver is ready to receive serve.
4.J.1. After one technical warning has been issued by the referee, further delays on the part of the server or the receiver exceeding 10 seconds shall result in a technical foul and a point awarded against the offender.
4.J.2. If the server serves the ball while the receiver is signaling “not ready,” the ball will be re- served with no penalty and the server shall be “warned” by the referee to check the receiver. If the server continues to serve without checking the receiver, the referee may call a technical foul and award a point to the receiver’s score.
4.J.3. After the score is called, if the server looks at the receiver and the receiver is not signaling “not ready,” the server may then serve. If the receiver attempts to signal “not ready” after the serve is made, then the serve stands, whether or not the ball is returned.
IFP Comment: A receiver who attempts to return the service shall be considered to have been ready. If the receiver has signaled not ready, the service must be replayed.