You skipped the following sentence in your quote: "Other researchers consider it a protoscience, or trans-science system instead."

Early thought systems evolved from hundreds of generations of folk wisdom. There are significant enough gaps in modern scientific understanding that to discount these systems is foolish.

Note that the current discussion is set in such a gap.

From the god of the gaps to the pseudoscience of the gaps. The same 5 old tricks to justify superstition and folk belief.

I'd expect most traditional medicines to be considered pseudoscientic if they predate the invention of the scientific method.

That said, I'd take science-driven modern medicine over weird herbs and rhino horns any day of the week.