htcpm2

http://bridgewithdan.com/systems/WJ2005webpage.htm In section "enemy interference over an opening 1N" I see over a 3-level preempt, double is negative; bids at the 4-level are natural (except for a cue-bid); 4♦ over 3♦ = both majors 5-5 and 4♦ = Texas for hearts, 4♥ = Texas for spades (provided that the overcall is at the 3-level) Do they contradict each other?