I just spoke with Lucid while tweaking my order and they mentioned they just have updated battery specs for the various models, see below. I questioned the number of modules and kW for the RWD Pure; they checked again and said below is what it says. The 16 modules I had never heard of, but perhaps Lucid removes the two stacked modules underneath the rear seats, that plus the 'foot garage' equals 16 modules.
Pure RWD 65kW 16 modules
Pure AWD (dual motor) 82kW 16 modules
Touring 92kW 18modules
Grand Touring: 113kW 22 modules
Grand Touring Performance: 118kW 22 modules
I cannot see how the Pure RWD kW makes sense, a lighter car the Tesla Model 3 AWD its 358 miles on a 75-80kW pack. I suspect the data is wrong, but I asked multiple times. Maybe the Pure 406 mile range is only for AWD, and pure RWD is a lower range that has not yet been published.