Phantasms of the Living is a remarkably rigorous work, and it took years to produce. Your assumption that only "prospective" studies with blinding and control conditions is the only basis for valid scientific data is incorrect. You have not only a misunderstanding of what can consist of evidentiary scientific data, which is far broader than you assume, but the nature of science itself.
I am exquisitely familiar with data which has evidentiary value, having taught it for a number of years. Please consider reading the link Arouet provided earlier. It is very informative.