In the pickling recipe? No--it's a basic lactic acid pickle (like the old kosher deli pickles you would get). The natural bacteria makes it acidic rather than adding vinegar. I use it mostly with cabbage, celery, carrots, radishes in a dish called pao-cai. Here's another article on it that shows the long beans:
https://blog.themalamarket.com/sichuans-naturally-fermented-pickles-pao-cai/
I understand your concern about the vinegar though--this is not a hot-pack canned recipe that is shelf-stable. You have to eat it before it gets too mushy (or sour), and you need to be careful that you don't contaminate the brine when you retrieve veggies.
Before my sister bought me a fancy fermentation crock, I used a fishbowl. You fold a big cabbage leaf to cover it, and then use a smaller baggie filled with the brine to weigh the cabbage leaf down. Here's a photo of the old set-up.
View attachment 12586
Chinese leave them long and then cut into short segments (like 1/4" or smaller) when preparing the dish.