The FAA statement:
Although ICAO has published a table comparing friction values to subjective terms, there is no recognized or appropriate engineering correlation between MU values and the subjective pilot braking descriptors of "good, "fair," "poor," and "nil." "
...appears fairly meaningless. The ICAO table has been around for years and represents a well accepted correlation between subjective and objective assessments. It is certainly 'recognised' by any normal definition.
For your scenario you have to rely on your operations manual. If you are prohibited from planning to land at a destination that has poor or medium to poor (0.29) braking action expected at your time of landing thank the foresight of your predecessors. If not, you're a bit more on your own. As an example of the regulatory confusion you might encounter the UK CAA have an AIC extant which states that pilots should avoid operating on contaminated runways wherever possible which conflicts rather awkwardly with JAA guidance which allows ops from contaminated runways.
I have to say, I'm with the AIC. Contaminated runway ops are extremely dangerous.