No. Defenders (in this case the German pinned units) are not halved, only when they counter attack. Check the CCT legend - it says
by Pinned unit [emphasis added]
It doesn’t say by/vs, or similarly, as it says with the other modifiers. This was actually a comment under the video that inspired the tutorial.
I’m less concerned with the rules in this tutorial - though I strive to follow them - and more with the functionality of the module. Yes, you are right, §3.2.1 says
Neither player may make a LOS check until after an attack has been declared.
Hopefully the player have read the rules thoroughly 
The rules says (§3.3)
Units enter from offboard—either at the start of a scenario or as reinforcements—as directed by the scenario card, including turn and location of entry. Units are set up offboard along the specified edge(s) of the map at the start of their RPh in the Player Turn of entry.
I don’t see any requirements as to stacking (which doesn’t make sense because units can peel off a stack at any point, AFAIK), and there’s no other requirement than the edge on the placement. Clearly, if the Scenario Card is more specific, then that should be followed, but in general, I don’t think there’s any such requirements. Maybe the procedure you refer to is a convention rather than a rule. But please point out where I might be wrong.
Because a Team is the next level down from a Squad in the NATO hierarchy. ASL’s vocabulary is sometimes a bit funny. For example “Half-squad” instead of Team, and Casualty reduction, when the casualties are not reduced, or Quality reduction, instead of demotion.
That’s a biiiig parenthesis as I actually don’t own those games. I know the rules for all 4 SKs are available from MMP (I refer to them in the module), but I would like to have them physically too, and then there’s the graphics which isn’t directly available at any reasonable resolution (VASL uses relative low resolution graphics - probably to now strain the system too much given all the stuff they put on top of Vassal).
I’m glad that you find the module useful, and I hope your fellow gamers do too. ASL is such a complicated system, and I really wanted Vassal to help me un-complicate it - that was the aim of the module - I hope I have had some measure of success.
BTW, in the next release, you will also have tables that give the probability of IFT outcomes given FP, DRM, and Cower. That should also help starting players make more informed decisions as to what to attack when
Some of the probabilities are quite surprising. For example, if you have FP=4 and Cower=-1, you have roughly 20% chance of 1MC or PTC, 11% for NMC, 40% for no effect, and very small chances for K/1 and 2MC. Compare that to the case with no Cower, where the PTC chance is lower by roughly 4% point, and the NMC increased similarly. Adding DRM=-1 drastically reduced the chances of “-”, and allows for a 1KIA result.
Thanks again for your feedback.
Yours,
Christian