Amen. Some folks make up words when they don't know that a real word exists that covers the concept, or when they wish to appear more learned -- an example of the latter would by a Navy Lt. Cmdr. I knew who used the word "observate" instead of "observe."
After I posted, I thought that perhaps the infelicitous 'robusticity' was actually some sort of technical word expressing an index of bone thickness, or whatever.
Even so, it's an ugly word, like 'orientate'. (cringe!)
Also people who can't speak the King's own English. They say things like "conversate". Unfortunately, eventually the words will become acceptable in polite society and get space in Merriam-Webster.