There seems to be a typo in UM1670 - Discovery kit with STM32F429ZI MCU, Section 6.7. (TFT LCD).
It says "The STM32F429ZIT6 controls this motion sensor through the SPI interface." But it talks about ILI9341 LCD controller, witch is NOT a motion sensor. Yes, ILI9341 can be controlled via SPI, but its performance is better when used on LTDC. This line seems to be a copy-paste typo from the section above that talks about gyroscope mems and IS NOT the best representation of ILI9341.