Plat printing is mainly sensitive to UV light, the bulbs in the paper exposer (it's not an enlarger!) are essentially un-filtered blacklights. On top of this, the exposure time for Plat printing runs into the minutes, as it is not at all sensitive like your ordinary Ilford paper.
The intermediate negative can be used again and again, and you want it to be done from the best quality printer with the best inks possible. What's interesting was looking at the intermediate curves he applied - first he used photoshop to adjust the image to taste, then inverted it, then curved it for printing.
As far as using this for regular silver prints, the whole idea runs in the topic of "alternative darkroom processes" or "hybrid darkroom".