To clarify a little bit for OP: the same sound device is shared between the laptop's speakers, headphone jack and its video outputs like HDMI.
It's the same sound card but under a different profile to send the audio to the HDMI instead. Technically the same also happens but more automatically when you plug in wired headphone, it triggers a port switch. It's an either or situation: it can only do one at a time except on some chipsets. That used to be an interesting audio quirk back in the days: plug in headphones and it keeps playing through the laptop speakers.
Plasma only shows independent audio devices because it's not just a global audio device selector, you can also select individual apps to go to different audio devices, for example an external mixer and a dedicated music channel.
That. He would have started YouTube at 20 and the guy is now 35. That would have happened when he was 28.
People change, people learn. That one in particular hit him hard and probably led to a lot of self reflection and all that stuff.
We have actual nazis to deal with that actually think it's a good idea. There's a huge difference between a bad dark joke and actually supporting facism. How one responds after such an incident matters a lot.
Meanwhile Elon did a literal nazi salute and isn't even denying it nor apologizing and doubling down on it.
I had my share of hitler jokes, but they were told on a context when it was seen as poking fun at a solved issue of the past in a very progressive area, when nobody thought we'd be dumb enough to witness facism ever again. Context and meaning are both very important before labeling someone for life.