It is pseudoscience because whether or not it works, it doesn't follow the scientific method even closely. It pretends, but it doesn't do. As shown above and in all the other episodes of this series, it doesn't go through the rigorous protocol of peer review, replication and scrutiny that real science has to adhere to.
Something working is irrelevant in this case; acupuncture has been shown to be just as effective if you replace needles with toothpicks that don't penetrate the skin and acupoints with random points all over the body. You could just as well say toothpick-ology is a science and that we just need to figure out why!
So yeah this is what we tend to mean when we say pseudoscience.
Yeah, the massive amount of pseudoscience around TCM makes it difficult to find actual objective research or justify research funding.