I think you mean kool-aid, which refers to the well known American fruit-flavored drink mix brand. "Cool aid" on the other hand is completely nonsensical.
Thanks for pointing out the issue with the video, should be fixed now. Interesting product you sent, although personally I'm not a huge fan of these uncanny valley-esque AI avatar tutors. Might just be me though.
Hume has an API for realtime expression detection - confusion states get injected into the LLM, kind of useful for better turn detection if the user is struggling but honestly doesn't work that well right now