It's not about whether UX is important or not - and I agree it is. It's about what 'exponentially better' means. Which is to say, nothing technical, and hence something buzzwordy without a solid foundation.

It doesn't detract from the product I'm sure. But he could just as easily have said 'vastly superior', and so doing not made me go 'Danger, danger, casual disregard for meaning ahead'. Especially since disregard for meaning is a bad thing in UI design.