Wow that's weird. You've never heard of the Optima card? But they think you have one. Did you ever have an old Amex many years ago? Or any charge offs with them?
The Optima card is kind of their "rebuilder" card for people to get their foot back in the door with Amex. It started many years ago as a regular card, and was dropped from that role and eventually became offered to people who had charge offs with Amex as part of their "Oasis" program. Basically you paid Amex what you burned them for and they gave you an Optima card with I think 50% of that limit. It never grew from there, and I heard they would not offer you other cards if you had an Optima - you had to close the Optima first and wait a bit then apply.
So I'm thinking either you had an Amex before from the way distant past, or there is some massive mistake where they think you have an Optima card. It shouldn't say you have an Optima - I have a BCP and I have never seen anything about this card in the email I get for making payments on it - they thank me for making payments on my Blue Cash Preferred.
There is a link to more information about the Optima on this site, you might want to take a quick look, but that is strange:American Express Optima Card: What You Need To Know In 2013