To quote from article ...
'And the British F1 star reportedly had an argument with the aircraft's pilot after he found out he had pooped in the driver's private toilet.'
Without knowing the exact circumstances, it does rather make you think this guy purchased the wrong aircraft (I.E. one with a single aft cabin chemical toilet) if he's concerned about such things...
I flew a 605 for a while, I developed an over sized bladder for sure in that time.... walking thru the cabin was not welcomed nor etiquette... Later flying a GLEX only a slight improvement, the forward loo was always stacked ceiling high with catering so required advanced tactical planning! The fun of biz jets..... quite miss it!