Acupuncture has cured millions of people for more than 2,000 years, so if you are logical you should understand that your pseudo meta-analyse has a very small weight against these facts.
The core principle of acupuncture is that 1 doctor is performing one individual diagnostic for 1 individual patient. So If you enter thousands of wrong diagnostics into your analyse, you get statistical noise. Now about placebo effect, if western medicine cannot explain placebo effect, there must have something that this science don't understand. How does the brain work ?
https://aeon.co/essays/your-brain-does-not-process-information-and-it-is-not-a-computer
Nobody knows.
When you bring a drop of water on a seed, the seed germinates. You can think this is a chemical process only, but I think that there is an energy that will organize a plant from a seed : the QI.