Has there been word of braking reports that day and time?
I would assume the BC was well under 0.10.
Information in the Boeing presentation
Landing on Slippery Runways
(slide 15) indicates that for the 737, reverse is not credited in certificated data.
The link leads to something that is definitely not a publication from Boeing.
Also, it is rather poorly written - as if English was not the writer's first language. Possibly.
No offense Mr. PEI, just being a pedant I suppose.