Well that might be the ticket for the 6.9. The description reads right. I don't think there was ever a direct injected 6.9, only the IDI, so I'd say the piston is listed right and they just used a stock image. It's pretty common amongst parts places.
We call that dish a mexican hat, and on a DI engine that would be where the fuel is injected into and is the combustion chamber. An IDI has a pre-chamber, and doesn't need that mexican hat, and instead has the "swirl" area on top to direct the flame front leaving the pre-chamber. Not sure what running a mexican hat in an IDI would do, but it would likely start poorly due to the big loss of compression ratio.
Jensales is big in ag stuff, so it's not like they're chinese or some clueless reseller. I'd give them a call/email and see if they have those pistons in stock, and if they do, have them take and send you a picture of the piston top.