This beggars belief.... why would clear, dry and paved runway had anything except "good" as BA?
if there is two information in the Atis
There can't be two information in ATIS, it is just this one is probably fully automated and programmed to always report braking action even when it is really not necessary. BA good means .4 and above, if one is to use tester on dry runway results would be probably out of scale and chances are good your slippery+BA good calculation uses 0.40 as the friction coefficient. Safe you would be but performance penalty might hurt you economically and quite unnecessarily at that.