I have a feeling Fallen Angels don't have intellectus. Just a guess based on how Just m incorporates real world beliefs and how real world theology says demons have less going on than angels. Of course, Jim changed things as he sees fit and real world theology is extremely varied ...
I think the domain over which Angels have intellectus varies; and perhaps not all Angels have it. The Angel of Death likely has intellectus about people who are dying, for example.
I'm pretty sure Anduriel is "Master of Shadows" and that has him hearing out of
every shadow. Mostly, he ignores this, but he keeps an ear out for his own name (and likely the other Denarians; maybe all Angelic Names), and certainly kept tabs on Harry for the duration of
Skin Game, among other topics he tracks routinely, and/or for specific missions.
Still, I suppose that isn't _quite_ an Intellectus, because it's knowing what "many" but not "all" of what his Shadows can hear.