This article mentions the expansion pak but this wasn’t even released at the time of the game. The sequel, Perfect Dark, relies heavily on the expansion, while Donkey Kong 64 requires it due to a game breaking bug.
I got the impression that the expansion RAM is mentioned (in a screenshot) to convey how little RAM there was period, even with the pak. Neither the article nor the video (afaik) claim that Goldeneye had access to that RAM
