Anthony died earlier this year. The books were self-published and (mainly) sold by Anthony. I don't know what is happening with the remainder of his stock, or with the considerable work he had done on the yet unpublished volumes.
Surely some Norths will feel that this hand, with all four aces and five quick tricks, is too strong to open 1♣ and rebid 2N. If North opens 2N, then North is likely to play 4♠, and a ♥ lead is quite likely against this, allowing an easy ten tricks.