The AmEx issued by HSBC (and BofA and USAA and all the others) is an AmEx in the sense that it is processed like other AmEx cards, and has generally the same consumer protections. But it is not issued by American Express Centurion Bank, so your old problem card wouldn't automatically ban you.
But an unpaid CC bill of that amount is probably going to give any lender pause, so be ready to have to explain it to HSBC or anyone else, unless you wait till it falls off (which it sounds like you're doing.)
* Credit is a wonderful servant, but a terrible master. * Who's the boss --you or your credit?
FICO's: EQ 781 - TU 793 - EX 779 (from PSECU) - Done credit hunting; having fun with credit gardening. - EQ 590 on 5/14/2007