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OT, but I wonder when Lennart Poettering was hired at Red Hat.

I think about 10 years ago. I was hired 8 years ago and he had been around for a while.

Which would be after PulseAudio but before systemd.

Definitely before systemd.

PulseAudio became default in Fedora 8 (August 2007 [1]), and the feature page lists Lennart as the owner, [2] so the time checks out.