I did hear recently that NXP is will be pulling out of MEMS production and transfer everything to STm, not sure about exact detail, but the fab should be in EU from what I remember. Could be the one in Milano.
My company is going back and forth between NXP and STm for mems accelerometer, for various reasons - supply, quality, qualification (automotive)... and I've been involved in some of the qualification procedures from the SW PoV, and about 3 months ago our MEMS expert mentioned this about STm fab in EU taking over completely MEMS production...
I would expect their cortex production do be done at one of the big foundries in TW, and not at their smaller fabs in Europe.