So here is a letter response from Customer Service, and responses via phone. This does not constitute an official rules decision until it is updated on the faq, and the phone guys are sometimes in left field. Regardless, here it is.
I e-mailed the following to GW CS.
I am having some trouble understanding an entry in the new Imperial Guard Codex Update (FAQ)
"Page 96 – Infantry Platoon, second sentence
Change to “Each Infantry Platoon is deployed in place of a single unit in missions that limit the number units that can be deployed. In addition when making a reserve or outflanking roll, roll once for the whole Infantry Platoon. Any units in reserve that are embarked upon a non-dedicated transport are instead rolled for separately.”
Does the 3rd sentence imply that DT Chimeras are part of the Infantry Platoon for limited unit deployments like Dawn of War? Specifically, in Dawn of War, can I drop 2 Infantry Platoons and 12 Chimeras as my 2 troops choices before turn 1?
I received the following answer...
Currently with this new change I believe that you are correct. Now if you're playing in tournament or some special event that you will need to speak with the organizer to see how they plan to rule that specific question. Should you have any other questions give us a call at 1-800-394-4263 and we will work to get them answered.
Games Workshop Customer Service
Please do not delete previous email threads as this will help us serve you better!
6211 East Holmes Road
Memphis, TN 38141
Games Workshop Customer Service is open:
Monday through Friday 9:30 AM to 6:00 PM CST
I then called the 1-800 number and spoke with a different customer service rep.
I received the same answer.
I asked about Al'rahem outflanking with empty transports.
I was told they outflank also, empty, because they are part of the platoon which must outflank.
I asked about an IG IP in reserve with empty chimeras.
I was told its all one roll for when they come in because the empty chimeras are part of the IP
The person I spoke with claims to have played 40k at GW for 10 years as well as playing IG personally.
While a phone call or email to customer service is not an official ruling, this is good enough for me.