Call them and remind them to report. They are usually pretty good about reporting.
As for the HSBC Amex, it is a special offer like the Discover Platinum. There are actually two Discover cards from HSBC: Rewards (which usually has the $300.00 CL) and the Platinum (which usually has a better CL. I got an offer for the AMEX app. just a few weeks after I got the Discover apps. By then, I had too many HSBC cards and was turned down for the AMEX.
I know that other than getting that preapprovals in the mail, both the HSBC AMEX and Discover Platinum cards are not advertised by HSBC and are very hard to find online.