You're logic is flawed. One person is not enough to go on. Besides, he said he rarely daydreams, not doesn't daydream at all.
Unless you do something like a survey of dreamers on, again, a large scale, you may get some material for this. But again, what would that prove? Just because they're may be some dreamers that don't daydream much, that doesn't disprove the theory of a link between LDs and daydreams. If there is, maybe we just haven't found it yet, and vise-versa.
I'm still looking for that daydream article.