I ran into this word in the Deutsch forum. I made a tangential comment that I didn't think this was actually an English word, but my comment got deleted for being off-topic, which it was, but not before the poster replied that it was a term used in linguistics. I searched for 'exbraciated' in the German forum and saw that it was being used a fair number of times. But then I searched all of WR forums, and it only appeared in the German forum, plus one entry elsewhere that was also associated with German. I can't find it in the OED or in Linguee. So I began to think that although this word looks like a real English word, maybe it is just a word that Germans thought up and started to use in English.