Similarly, maybe only a few people have access to Star-Gate episode #23. But if they say that in that episode Cmdr. Pickett gets eaten by a Florgbernian Rumpox, then I'm willing to ASSUME GOOD FAITH.
In which case, your source isn't the episode, it's those few people that watched the episode. The episode is reliable, those few people are not. Therefore, you do not have a reliable source.