You are right - this article definitely existed. It might have been quite late in 4E, and in regards to the then-upcoming Controller Ranger and stuff. Or it might have been earlier, but I remember it too.
Ranger has never covered "nature knight" in any edition I've played, though, and it doesn't look like it covered it in 1E, either - 2E has you very much as the dual-wield tracking guy who wears light-ish armour and has thief skills - very light-seeming. 3E had, er, a mess. 3.5E had slightly less of a mess (I honestly don't remember it well). 4E had a ranger for every season, but none of them were a knight/tank-type or a shapeshifter-warrior.
The 4E Warden was no more arbitrary than the D&D Paladin. But no less, either.

I mean, most of the D&D Paladin's actual abilities, especially in later editions, are not really drawn from fiction, they're just stuff that
seems right (often that appeared in computer games before D&D!). There's consistent theme-ing, but it's an arbitrary design decision to put all those abilities on one class and separate it from Cleric.
Warden is in the same place, but re: Druid rather than Cleric. Yeah, most of his abilities could be Druid abilities (not so much Ranger ones, really), just as Paladin ones could be Cleric abilities, but you can break away a decent class by separating them, and he does lots of stuff that D&D's Druid doesn't (but that some other Druids in CRPGs and MMORPGs, have done - Warden as nature-knight was a class in 2001's Dark Age of Camelot, for example).