How would you apply this to the Pathfinder RPG or to True 20. Are those 3pp games, in your opinion, or 1pp games?
I haven't read the True 20 rules, so I cannot speak to them.
I haven't read Pathfinder, either, but everyone speaks of it as "continuing support for 3e". The whole point of the game seems to be how close it is to 3e, rather than it being its own thing - that positioning makes them 3pp, to my thinking.
Over time, if more folks play Pathfinder itself, instead of 3e supported with Pathfinder materials, then perhaps I'd change that opinion.