What would happen if the pilot in question had used non-standard RT during a sim check? He'd be grounded and sent back for re-training.
Surely he should have his "professional" head on when he's in the front of an aircraft. He clearly didn't in this case... Either he panicked, or he doesn't give a damn about standard RT!
I know his primary contact is the controller, but it could be vital that his transmission is heard and understood by other pilots as well. For example, if someone is on approach and cleared to land behind another aircraft (as happens all the time in the US, which personally I find stupid but hey-ho), and the aircraft ahead gets into difficulties, surely it's pretty damn important that they know about it too and so they can prepare themselves for the go-around etc?