I doubt the DMX part is coupled that closely to the IR. No one is bit-banging their IR protocol (or even its baseband) over DMX — even if it could work, the lighting console would need extremely special support to speak the protocol.

The DMX part would be like any other light: a pair of channels controls the coordinates to which the transmitter’s gimbal aims, one channel selects a color, one channel selects a command, a channel or two set some other parameters, etc. And the electronics in the transmitter unit convert all this to actual servo commands and to the encoded IR signal. There wouldn’t be a channel to select the active vs inactive state of the IR modulator, as entertaining as that would be. (DMX has a maximum frame rate of 44Hz. Following some links, the PixMob bits are 694.44 microseconds long. RS485 is plenty fast to carry the baseband signal, but DMX isn’t.)

(It’s been awhile, but I have operated DMX-controlled moving lights. And yes, of course I’m speculating.)