I made that mistake too, the correct calculation is here:
Open Source Digital Cinema Camera based on Elphel - Page 3
those 60dB are in terms of power
1000000:1 in power = 1000:1 in voltage --> 10 stops
and 90 dB --> 15 stops, but it uses the HDR mode, which they call "dual exposure" and "dual readout"
that dual readout can be like in the scmos chip (the one that the BMC seems to use) (the chip has two different readout logic circuits, and can use both at the same time) or like in the RED EPIC (in HDRx mode, there's a first 1/50s exposure, then a short 1/800 exposure to preserve highlight detail)
if it's the former, I'd love to use this chip; if it's the latter, I'd avoid it, 10 stops is too little DR in standard mode, and HDRx is good for some situations but troublesome for others
the problem is that I don't know which kind it is: there's very little information about the cmv12000 online, it's not even featured at cmosis' web page, even though the announcement was a long time ago, and to my knowledge there are no products using it yet...