Home Brew,
One of the problems here is that the ATIS does not seem to be updated at regular intervals, at major airports in OZ, and I must assume that YSSY is A major airport!!
Perhaps this is because at some O/S airports the ATIS isn't actually done from the Tower but from using the METAR. Yep, done from the APCH room using the info from MET, and using TRUE winds from the MET sensor rather than MAGNETIC winds.
Its hard to defend the indefensible but I'd be interested in the date that prompted the initial post and I'll compare the ATIS with the METAR/SPECI.