Comment 92 for bug 1801540

I, too, tried without pulseaudio and plain alsa, and too noticed, that the noise is different (in a way that makes it slightly less annoying).
This however does not mean, that eliminating pulseaudio eliminates the noise issues, pulseaudios parameters just make the noise profile seem a little worse.

In any case, the quality without pulseaudio is still unacceptably horrible and I would never make anyone else listen to audio captured with said noise willingly.
This clearly is not a pulseaudio issue.