There's lots of OSINT but finding something particular might be difficult - you could contact the author (his twitter is in the article) or you can find various

There's lots of OSINT but finding something particular might be difficult - you could contact the author (his twitter is in the article) or you can find various materials at the Defense Technical Information Center, such as https://discover.dtic.mil/results/?q=china+electronic+warfare https://discover.dtic.mil/results/?q=china+electronic+warfar...