Does the i.MX RT1060 / Teensy 4.x support Bit-Banding?

The i.MX RT1060 is a Cortex M7 microcontroller. Cortex M7 microcontrollers do not support bitbanding. Hence, the i.MX RT106x series (including the Teensy 4.0 and 4.1 boards) do not support bitbanding. See this ARM forum post for more details.