On the same basis (current and accepted scientific analysis), pilot knowledge is considered a primary component of SA.
Knowledge could mean almost anything, that kind of general statement is pure fluff, it means nothing.
Knowledge of what? Your plane, their plane, physics, aerodynamics, BFMs, ACMs, the immediate vicinity, the larger strategic area, the price of tea in China, the going rate for a BJ, the relative E states and likely intentions of 20 friendly and enemy cons, etc?
The fact remains that decisions can be made based on observations alone, if knowledge of that information is what you're talking about well...duh?!? no chit?!? But, if by knowledge you mean of ACM's than that is a load of bull pucks. With almost no ACM knowledge very good decisions can be made based on SA alone such as whether to engage, disengage, switch targets, commit E to a con, preserve E and regain altitude etc. None of that requires any specific knowledge of ACMs necessarily, although it certainly couldn't hurt.