Why not link to the official recording ?

https://media.ccc.de/v/39c3-liberating-bluetooth-on-the-esp3...

C3 also pushes to YouTube: https://youtu.be/q-_YVIIrF6A

The bot posts what @bsandro posted on lobsters https://lobste.rs/s/n7u47v/liberating_bluetooth_on_esp32