In the review, they say the e-stats are from "Shengyang" which I'm pretty sure is just a bad transliteration of "Sonion" into Chinese. If you Google for "Shengyang sonion", you get quite a few hits. For example, one eBay page advertises the DUNU EST 112 as having "Shengyang" e-stat unit, which we know for sure is actually from Sonion.
Thank you for the info