No, they are not valid and neither is Ray Blanchard. All have been discredited by the larger scientific and medical community. Every profession has its outliers looking for notoriety and fame and fortune. The fact that such people exist is the reason that repeated peer reviewed research is done to assure that there is a consistent picture which emerges. Lisa Littman and Kenneth Zucker are quacks, pure and simple. No accredited organization gives any credence to their beliefs.