A lot of scientists dabbled into pseudoscience but that doesn't invalidate their scientific accomplishment, and their scientific achievement doesn't validate their pseudoscientific pursuit
I am sure there are some truths in some thousand years of research, ala "Don't throw the baby out with the bathwater", but that doesn't validate the system or study as a whole.
If you take an idea with a pseudoscientific origin, and you test it in a sound scientific way, you're doing science, not pseudoscience.