Sorry for the late reply.
I appreciate your feedback. As you write the latest (supposedly, I am not sure but I trust you here) new news was back in 2016. That is a very long time ago. In particular in our part of the world. Also given regional events that have impacted KSA directly since that time (civil war in Yemen and subsequent KSA involvement on the Yemeni government side and subsequent, in the 100's if not 1000's, of ballistics missile and drone attacks aimed at KSA - vast, vast majority dealt with successfully as I demonstrated in this thread earlier by posting sources), recent regional conflict etc.
Which are further arguments in favor of the Chinese participation nowadays being mostly in an advisory role.
Maybe I am blind, but I don't see you necessarily disagreeing with my conclusion in this regard.
As for the organization in question, I never said that they do not longer exist, merely that if they exist, their role likely advisory in nature as I wrote, has changed a lot from when it was initially created in the 1980's, where KSA, outside of cooperation and support for neighboring Iraqi and Egyptian missile projects, was indeed limited in terms of knowledge and accomplishments in this regard.