I would guess that it is the fictional-arcade-game thing that makes this game attractive in the first place. Especially when converted to a 1982 computers as the C64, which is home to a lot of early 80s arcade conversions. So, of course the developers want to play along in that makebelieve world.
The Commodore version it's more like one of several real adaptations of the fictional version of the game (Tobikomi it's obviously the most fictional thing about the game, since in his universe he was created by that company).
That includes the first playable version (the 2012 version) as well, which is by far the most faithful version to the movie version (I leave you an example video of this excellent playable imitation with its arcade cabin):
For us it will be real, but for history it never isn't real & won't it be.