That is the point. With only this planet observed he assumes that is the only way it can manifest.
But even more to the point is that he is well qualified to make it. Townes is a very smart fellow, a Christian to be sure but a scientist whose accomplishments are quite substantial.
His being a Christian or a very smart fellow are neither a plus nor a minus to me. I took his words, that were posted to me and I reposted to you, at face value and they amount to assumptions based on assumptions.