This is not true. I regularly hunt NS41W with Adj Pixie, no plates and an unamped Kallous 3,5 or 6 and have been doing it that way since I started hunting argos. Furthermore, aside from the few rare times that Akoz forgot to feed the argos, the density has been as high as it is now as long as I have been playing this game. 2 years ago, you used to see a few more scouts and gatherers there as well. Now they're pretty rare and probably just wandered over from 41N.
NS remains IMNSHO, the best low maturity argo spawn on Calypso. Full facilities, a TP and plenty of argos.
Personally, I wouldn't mind seeing a very slight bump in maturity to get a few more gatherers in there. BTW, I'm on the Argo silver mission, gatherers don't help me with it. I hunt NS because I like it there.
If you are bothered by getting a beating on argos, get some range on your weapon and tag them from outside their aggro range (the inside circle on your radar, red dot in there and it's aggroed, outside that and it won't charge you unless it's a scout or higher). Or get some cheap plates. Or invest in 5b plates and have a wider range of hunting opened up for you. Adj Pixie + 5b is probably the most versatile set you can have.