Certainly this is true for actual battery production, but TE requirements gives GF1 flexibility in producing battery packs. A slowdown at Fremont can benefit power walls and power pack production. Flexibility is important. (I have trouble putting on socks!!)
Only in terms of shared resources. TE cell chemistry is different from TM and module/ pack equipment is different also.
With the cell aging process, they need a ~month? look ahead for switching cell type production. Given the slow 3 ramp, if they don't already have a huge TE cell inventory, then the Panasonic equipment may be specific to cell chemistry...