Yikes. What a shitshow. Leaving aside the discussion of what constitutes good or bad behavior in the context of that situation, I think this scenario offers a good example of Things To Be Careful Of in scenario design (VC's that involve multi-hex multi-level building control, VC buildings way in the back, mutually supporting and surrounded by Runways, defender has tons of HIP options, etc). I find myself being more curious about how to fix the scenario than how to play it as the Greeks against the Secret Evil Defense.
But yeah, I too wondered why that defense would be so Evil. It would seem to be a good thing for the attacker to see the defender reveal all of his HIP units without firing a shot. (It would probably up the Evil Factor for the Germans here to let the Greeks have a turn or two of cautious movement before he revealed his units, but whatever).
As an attacker, I tend to be as aggressive as I can be, up to the point where I've paid "enough" of a price, but I also want to take advantage of the openings that may occur because that price was paid. I call that a "greedy" algorithm. So as the Greeks here, I'd probably CX everybody and take chance after chance on turn 1, whistling past the graveyard time after time and growing increasingly puzzled as I got away with every move, but bemusedly pleased that my moves were going unchecked.
But perhaps the Germans did have some picket defenders. If the Greeks have 12 attacking squads, I'd probably push until, say, 3 of them were broken. If those 3 happen to occur in the first 5 moves, well, Squads 6-9 will probably move more cautiously just so I can get something established on turn 1, and if they've survived, maybe by then I'd take more chances with Squads 10 through 12, because the defenders who trashed Squads 1-3 may have shot their bolts and it would be bad play to not take advantage of those opportunities to move outside of SFF range or a fixed Covered Arc.
Shrug. Lesson for Dave and Martin: don't pick scenarios that give Toby bad flashbacks!