That is odd indeed. Row 1 only has A,D,G and K seats - H definitely does not exist.
As far as I know, both older J ("old old", with recliners and 24 seats as well as "new old" with 20 angled-flat seats) has been phased out completely by now, especially on the AUH routes were the first to be on the new product. The only product where 1 HK existed was the "old old" recliner configuration which was yanked out of all aircraft in 2012.


And just on the chance your flight will be operated by EY: Of the two daily DUS-AUH departures, the morning flight is operated by an EY 332. But business class starts at row 5 in these...

I'd get the AB record locator from AA and check on their website, or give AB another call.