MEMS accelerometers use a similar production process to some other types of MEMS sensors, and are made on the same production lines.
list below swiped from
https://www.electronicshub.org/mems-sensors/* Accelerometers
* Inertial Measurement Units or IMU (they are combination of MEMS Accelerometer and MEMS Gyroscope)
* Magnetometer
* Pressure and Inertial Sensor
*
Pressure Sensor*
Airflow Sensor* Fuel Sensor
* Impact and Crash Sensor
* MEMS Microphone
*
Temperature SensorMost of those are in demand from the car industry, worse still the ones in bold are used in the Medical Industry.
So the reason you can't get an accelerometer is because new non-contact temperature meters and artificial ventilators are more important.
Oh and ST had entirely justified strike action last year, because they made record profits and offered their workers a below inflation payrise (because corporate grade stupid), so parts weren't getting ordered.
As for the TFTs, every city in China has one or more things they specialize in, Wuhan was Semiconductor wafer production machines. Suffice to say various plans to build new chinese semiconductor plants collapsed.
Then there are the two semiconductor fabs in Texas that lost power, and one Renesas plant in Japan that got shutdown by an earthquake and then had a fire a month later.
Supply chain is a huge mess at the moment, automotive is the hardest hit by those 3 fabs being out of action.