The article wasn't a "proof" for systema being heavily influenced by Silat - just that in the early days it was one of the threads that may have been woven into the tapestry called Systema. Just a point of interest. Kiai - "Dutch Silat" was probably a misnomer - probably just meant Silat - I didn't even know there was a difference between "Silat" and "Dutch Silat" until you pointed it out. The article was likely demonstrating the remnants of past colonial thinking from a European/Western perspective. "We've decided the Dutch control most of Indonesia - so the silat must be theirs." Sad but probably true.