First of all -- SeatGuru sucks. Use aerolopa.

And there you will find that, indeed, row 17 is a bulkhead row meaning no underseat storage, the tray table being stored in the arm rests (reducing available seat width slightly) and the IFE screen popping out from under the seat. The legroom however in economy is second only to the exits rows.

If you want to inspect more closely: https://xr.klm.com/klm/?type=Boeing&aircraft=787-10