Bit banding in Arm cortex M4
The bit specific address is an alias for an operation conducted on a specific bit of an address in the bit band target region.
If you wish to make a simultaneous change to multiple bits, you should not use the bit-band alias, but some other mechanism.  This might be a traditional read-modify-write operation.
Many MCU's also have their own vendor-unique hardware mechanism for GPIO modification distinct from the inherited ARM bit band idea, for example ST has the BSRR register where you can set or clear a group of bits on a GPIO port.