yup i agree but read this article
it states that brahmos had only inertial navigation system before fitting the gps-glonass!!
India Modifies Brahmos Missile With New Nav System | Defense | RIA Novosti
so pls read article in post 15 and comment on ins vs gps-glonass
Article you posted is just a year old (2012) , above article you posted of glonass are from 2010 , Incident happened in 2009 , So glonass integration took place later , and likely now Brahmos features both glonass-Gps . Later even Indian .
Remember Army Has three Blocks of Brahmos .