eBooks... that's one of the reasons why I still buy paper books...
Looking in a book from my "Asian" shelf called "The Asian Grocery Store Demystified" (summarized):
- Pickled radish = tang chi and tang choy. A large white root pickled to light ochre or tan color. Slightly sweet, salty-sour, and crispy. [in other words, daikon. I think what we often see may be artificially colored to make it more yellowish orange.]
- Szechwan preserved vegetable = jah choy. Pickled radish or kohlrabi, or other vegetable like mustard or napa cabbage. Dark olive green color and salty-spicy.
I'm not too familiar with that specific soup but looking in my collection of books it more often than not is rather plain and attributed to Northern China - Peking cuisine. Mu shu pork made into a noodle soup, it seems to me. The only dried/preserved is dried lily blossom, if any.
Your recipe may be a Szechwan version and I like the thought of the preserved vegetable taste.