It looks like you would need to somehow edit/disable:
/lib/systemd/user/pulseaudio.service
Also, since this is not actually a bug I am going to mark it as invalid.
But you are free to keep discussing the issue here.
** Changed in: pulseaudio (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1899352
Title:
Pulseaudio cannot be kept from starting or respawning
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