uhm, no, actually I think it's just the opposite. Yes, the artist and creator of PD Artist is a true talent too, but this software is aimed at letting many others do the same easily, as it shoots particles from the mouse and 'grows' the shrubbery and foliage from it.
The software is PD Particles, a standalone version of a particle paint plugin for Project Dogwaffle, called Optipustics. These can be found also in PD Pro, in v2, in the new PD Artist and in the freeware Project Dogwaffle 1.2 - not all in the same levels of sophistication, but still.