Both is true though. If the fact in the video game was correct, it is how you learned about it, hence it is your source of knowledge. Also, the research material with which you confirmed the fact is a source of knowledge. And if that fact in the video game wasn’t true, then the research material is a source but not the video game.
However, I wouldn’t list a video game as a source when I talk about historical facts but only as an initial spark of interest that led me to research said historical facts.
Both is true though. If the fact in the video game was correct, it is how you learned about it, hence it is your source of knowledge. Also, the research material with which you confirmed the fact is a source of knowledge. And if that fact in the video game wasn’t true, then the research material is a source but not the video game.
However, I wouldn’t list a video game as a source when I talk about historical facts but only as an initial spark of interest that led me to research said historical facts.