I think his statement is incredibly short-sighted. Has he never been to an art museum with interactive sculpture, etc? Perhaps he could hedge on the 'degree' of interactivity offered, but with such an emphatic 'only', I think its more likely that he is simply wrong.
Ah, pedantry, the pinnacle of all evaluations of a single statement one could make. Next you should criticize how the book doesn't cover decorator generators that use @wrap or how it doesn't cover discrete mathematics. That'll be very effective.
