Those seats are pitched by the airline. They are built to go full flat (as they do on IB when they removed a row of seats); the fact that they have pods is irrelevant to their pitch as the back and the front are not connected. The maximum recline is software-limited to avoid touching the end of the well in front.

As a matter of fact AA itself (https://www.aa.com/i18n/amrcorp/corp...acts/fleet.jsp) puts the pitch at 58-59 for the 75L, 59 for the 763, and 60/61 for the 777 -- so they're all slightly differently pitched.

Having said that, I cannot imagine why would AA have spent any money to decrease the pitch on the 763 when they have lots of extra space behind row 13 -- if they were to spend the money, it probably would be to increase the J pitch of the 763 (something I wish they had done)!