Lewis' stepson speaks for Lewis?

According to this article, Lewis' stepson is now speaking for Lewis, saying he would have been pleased with the new movie!

Now I'm definitely going to go see this movie, and I"m a huge narnia fan, but the fact that Douglas Gresham is co-producer of this movie makes me think "of course Douglas Gresham would say that!"

I think the movie is going to be great... but c'mon Doug...

Douglas Gresham speaks for C.S. Lewis