By long range AI, you mean something like a sniper? Yeah how could OST ever counter something like that...
I assume he means AA halftracks that can suppress Panzerschreck squads at long range rendering them useless and the rest of the army mostly defenseless once the Panzerschreck squad is forced to retreat. Without Paks or 222s Ostheer can't do anything against a well microd AA halftrack.