The point of a so-called "minor pentatonic chord" is that it uses only notes from the minor pentatonic scale. In D minor, it's D F G A C.
Dm7/G, F6/G, and Fadd9/D all do this.
Dm11 does not. It contains an E, the 9th, which is outside of the D minor pentatonic scale.
In the following voicing, from low to high, one gets the "So What" chord, alternating with the same voicing a whole step up:
D G C F A, alternating with E A D G B.
Unfortunately, iReal Pro does not yet have the capacity to specify voicings. It's on the wish list.
Cheers,
Jer