It's hard for me to believe that the model coherently memorized both the video and audio of a relatively obscure Let's Play, and that a simple prompt was enough

It's hard for me to believe that the model coherently memorized both the video and audio of a relatively obscure Let's Play, and that a simple prompt was enough to surface it (the use of the term "Basilisk tank" would also likely not be in video metadata either). That is the reason the person who made that tweet, who has far more prompting experience than myself, was shocked.