Can the VersaSTUDIO BN-20 print DTF?

No, the standard version of the BN-20 plotter doesn't print dtf.

In most circumstances, unless a plotter is designed for dtf printing, it’s necessary to make some modifications; in particular, the ink needs to be fed via reservoirs rather than cartridges.

Furthermore, a dedicated RIP would need to be used to manage the colour accuracy.