Sigh...
"While probably not an audible concern, it is nevertheless a blemish on the otherwise near perfect performance of the Purifi modules."
I believe Dylan when he says that it's not audible, otherwise I can't imagine he would have shipped even one out. He's been incredibly transparent and helpful.
I respect that Amir found a bug, didn't hide it, and reached out to Dylan. I wish he could have tested if it was audible, and if not, made it a caveat, instead of not recommending it. And worked with Dylan to test whatever fix that is needed.
I ordered one and it's shipping on Monday, my expectation is that it's not audible , and that Dylan will have a fix. (Consider there are many that are in the hands of customers already, and if audible would have posted something)
I have no regrets other than the grief this may give Dylan.