“PITCH,PITCH” is called out on excessive pitch attitude durring flare or excessive pitch rate (ie. FWC estimates that pitch att WILL be exceeded shortly).
This can cause an occasional spurious trigger when the pilot is a bit late&abrupt in his flare and triggers quick nose up defletion, even though he is arresting that pitch-up before it gets dangerous for a tail-strike (eg say 6deg), you might still get this warning, based on the pitch rate alone.
What is the exact pitch angle and pitch rate that will trigger this alert is anyone’s guess, as it is not present in any documentation that I have found. Suffice to say that a properly executed approach and flare will not trigger it, regardless of weather conditions. In my experience, only poor execution by the pilot will.