I'm sure this will get me some comments, but...
Could it be possible that AB/goose is big enough that they actually have malts custom malted/kilned to certain specs that you wouldn't be able to buy because it is custom made for them? I'm not saying that is the case, but it seems well within the realm of possibility. So why bother try to make a close replica with some standard 'home brewer' malts (I'm just thinking of the normal catalog that you would see at an average homebrew shop) instead of just pulling some of the malt off the silo that you are making the stuff with in the factory?
I guess I don't see the evil in it. Does anyone say "Screw Williams Brewing for not telling me exactly what is in their English Stout Malt Extract!"? If yes, I've never heard it. NB/AB/INBEV/Satan is using the brands it has to cross sell across brands, it's not that weird.
https://www.williamsbrewing.com/ENGLISH-STOUT-EXTRACT-33-LBS-P3491.aspx