Was a mystery to me, too! There is a youtube playlist, but you will not find it when searching within youtube or even within Numerai’s youtube account. Apparently because it is “unlisted”. But you can go here:
and click “save playlist” so that it will appear in your youtube library.
Thanks for adding the link here. They also announce them in “Announcements” on RocketChat when new ones are uploaded. If any new users read this post in the future I’d recommend joining, RocketChat has lots of announcements that don’t end up in the forum https://community.numer.ai/