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I'm not familiar with this classification, but it sounds very close to what I was going to implement initially. For example, I had Monsters, Trap, Guarded Treasure (=Monsters+Treasure) etc. Only Treasure and Event (NPC | Curiosity) got into the published version.

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In older versions of D&D they provided some basic guidelines for stocking new dungeons or restocking dungeons that had been left idle or abandoned by the players. These rules were more useful in the days when modules were rare or expensive and budding DMs were forced to use their limited skills and imaginations. There is a nice little summary of methods used between editions  here: http://deltasdnd.blogspot.com/2012/10/random-dungeon-stocking.html 

Here is also some newer interpretations of the idea with sub tables in practice should you wish to investigate further. 

http://aeonsnaugauries.blogspot.com/2011/11/dungeon-stocking-table.html

Thanks again for the generator by the way. I have used it to flesh out two mini side treks in a sandbox I'm developing. It really is a wonderful tool.