"Which is ASICMINER's bus factor?"
His post history indicates the answer is: 3.
I've looked over friedcat's history and didn't see anything that indicated that. Do you have any specific posts that provided that information?
According to this post (July 3, 2012) there are three founders:
"We" the founders are three people at this moment. One of the partner has been working on the hardware section of a general purpose CPU design group. The other one has been working on the software section of a embedded-system-oriented CPU group but is heavily involved in the front-end of hardware design.
So we have the ASIC experience, but in different larger projects, and as smaller roles than, say, "they are made by just us".
My assumption is that having three founders means that the business would be able to continue even in the absence of a single person. Whether or not that satisfies an arbitrary person's request for an explicitly stated "bus factor" is up to them, I am at least happy with this statement together with my assumption.