So you are in a rapidly changing world. Companies that don't learn much don't survive. People who don't learn much do survive, but their standard of living keeps going down. The truth of a proposition has nothing to do with its credibility. And vice versa.
Delusions are often functional.
The best salespeople are true believers. Judge their arguments on merit, not on the energy or apparent sincerity of their presentation. This upsets him long enough to let you make your second shot perfect. This is a maxim many marketers live by. If you're lucky, everybody else will get all caught up in responding to your promises, and lose focus on their own agendas.