I'd be careful about calling FCO updated. For example, people in the know know (where did I learn English?) that Morozevich introduced the ...Nge7 plan for black in the Albin Countergambit around 2005. Yet there is no mention of it in FCO, even though it was a major contribution to the Albin theory.
[Disclaimer: I do not employ the Albin on regular basis.]
there is this guy wu plays e4-b3-Nc3-Nf3-Bb2-Bd3-Qe2-000-h3-g4,
regardless of how black develops Sicilian Caro-french-petrov-pirc-A00 to him those moves up thr will be played No matter what you play. but will be calculating as well,
its not that playing a particular opening theory,
i think the question wants to know how you attack/defend someone who does not play opening theory moves, but playes their own stuff in their head, but make a mistake you loose,
and NB, these guys after setting up their positions wont play partzer moves, but will come in with aggression and tempered moves