User blog comment:Aleksandr the Great/Prothean Squadmate is Officially DLC/@comment-4820017-20120224125502/@comment-1871343-20120227075533

its possible that it was because they could not finish in November (the original release date) so it was planed as a DLC. or it was taken out of the main game because they didnt knew if they could finish it in time, and audio files doesn't proof anything. VOs are made long before the final decision what the final version is like