CATL already announced a LFP plans for Shangahi: (Jun 6, 2021)
CATL Planning 80 GWh Battery Factory Near Tesla Giga Shanghai
WuWa thinks it's nearly completed already: (Nov 23, 2021)
CATL factory nears completion 3 km from Tesla factory\Teslashanghai\4K # 365
The Nov 2021 article is fairly specific in that it says the project is for "existing production lines". So I expect Model 2 must be separate. Another source says ~4K new employees due to this expansion, so that's another way to estimate increased production, given 19K employees total currently (maybe +25% production).
The article also mentions the project is for "derivatives of Model 3 and Model Y". I take that to mean SR+/LFP, not the Model 2 which will require far more factory space at the volumes required for the new car to be profitable.
I hold that the Model 2 factory will be a new build on what is now the earthworks to the NE of the new Giga Shanghai R&D Center. They're going to need serious logistics to make 1-2M Models 2 per year at Shanghai.