Yes , I,m well aware ( Im also a DJ for salsa), and my library includes, sometimes , new releases with Bolero type music included on the albums( that what Intern rumba is based upon ) .
You are very entrenched in the restricted b/room world... there is a whole host of music out there that the " latinos " use for their pleasure .The B/room world is finally realising , that the tempi of these types of dances are far more suited to the original compositions .
There is one well known DJ that has 30, 000 albums !!. ( I,m not in that league )