Correct, the Renault/Nissan battery packs are pouches.
And yes, correct, Tesla has highly automated the process of assembling those battery packs from their cells, and its the same battery pack design that is used in the PowerWall and PowerPack units - they just churn them out by the thousand...
From memory, Nissan use large format pouch cells which are easier to package into modules. Tesla have clearly perfected and highly automated the process of connecting 6-7000 cells to create their battery pack. They seem to know their onions.