Huh, mystery solved, I suppose. All it took to look at the
Halo Wikia article linked in the OP, and note that the following is stated on the Trivia section:
The sign on the Tterrab Industries building seen in the level Metropolis in Halo 2 originally read "Askloun".[5] The name was slightly altered in Halo 3: ODST.
Here is the Halo 2 First look (linked in the sources, good job Halo wikia
), at 1:26.
How refreshing does this feel, finding answers after such a long time!
If what the Trivia suggests is true, then the "Askloun" name was set aside for the inverse name of Mr. Barret, the graphics designer of the game, or simply changed to AMG Dynamics. In ODST, however, Askloun/Asklon was probably seen as a more viable choice for a ambiance-creating company, and thus AMG evolve to Asklon. There is still a possibility that AMG is a branch of Asklon, or vice versa, as
both names are still used. The proof for that is to be found from Forza Motorsport 4, where at
this trailer (time stamp 1:10, at the very beginning of the manufactures list) "Asklon" is listed. Yes, the game indeed does include M12 FAV "Warthog" as an easter egg. Here's the interesting part: In the game itself, it is seemingly
manufactured by AMG, not Asklon. (0:24, Great video by the way.)
Perhaps both names are used, perhaps they mean the same, or perhaps Microsoft (and everyone else) is now confused about the whole thing.
The world might never know.