I have to agree that I thought their speel on in-house manufactured parts was a little hokey.
Pretty sure vast majority of internal parts would be sourced from sub contractors.
There maybe a few in-house parts though and possibly that is what put the kibosh and making more.
However we have their "official line " now so it is what it is.
Btw my last email to them I made it clear I was sharing this information on Audiogon forums so I very much doubt it is not correct or info that they do not want public.