The AdH alternated between steel and aluminum a couple of times in the late 90's and early '00's. The 853 steel frame model for the AdH came along around '02/03 and before that, it was a either 525 or Chromoly. The one is the listing is from around '01 I believe. It originally came spec'd with 105 group and Rolf Vector wheels.
This particular bike could be a good deal if it is in great shape. Those wheels are worth $400 used (or more) alone if they are in decent condition. Definitely worth checking out the bike.
55/Rad