PX4 VTOL SITL Mixing vs Real Control Allocation

Hello, I am currently trying to understand the control allocation (mixing) module in PX4.

In the airframe file 1042_tiltrotor /ROMFS/px4fmu_common/init.d-posix/airframes/1042_tiltrotor , the bottom two lines specify the mixer files to be used etc/mixers-sitl/tiltrotor_sitl.main.mix. However, in the airframe file 13100_generic_vtol_tiltrotor ROMFS/px4fmu_common/init.d/airframes/13100_generic_vtol_tiltrotor , there are no mixer files specified.

From my understanding, the new control allocation module removes the purpose of the mixing files. Does this mean that Control Allocation is only supported for real flights (running on NuttX) and not supported for SITL (running on POSIX) as of now?

Thank you in advance for any help and responses.