They've been doing Twitter Spaces for several months now, with recordings and show notes here: https://github.com/oxidecomputer/twitter-spaces Disclosure: I was the main speaker on one of their spaces.
On one hand I'm excited at the new content but a bit weird they way they stealth shutdown the podcast and started the twitter spaces thing up without saying anything or updating their homepage. Even their twitter feed only mentions the twitter space a couple of times (and doesn't appear to link to the archive).
I read a note quickly about Oxide and Twitter Spaces a while ago, but as I read the keyword Twitter with a mindset of "good for short notes and links to external sources" as I wasn't at all aware of voice capabilities, might be shortfall of using Twitter in the browser..
Thus I now have lots of interesting material to enjoy.