I believe that the SOG Aus6 has coating to protect it from rust and not bare steel.
AUS steel series is basically type 420 with higher carbon content. Still very stainless, but I don't think it is as good as 16%+ Cr steels.
Most high rust resistance steels don't hold an edge for long, unless they are PM steel with impossible composition for cheap ingot alloys, which is not great advertising points for knives. Say, AUS6 was phrased out because it can't cut as many cardboard and rope as many other steels back in the 2000s despite being extremely close to the composition of AEB-L and the current very popular 14C28N.