Oh yes, Claude seems to be loving the word vacuous recently. My test bed side project is full of vacuous this and that now.
I even try and get it to define what it classifies as vacuous and it can’t do so without getting stuck in some kind of trap. It’s like a word with some kind of huge gravity for it.
Had same experience. I had to look up the usage as it just seemed so out of place.
Like how opus 4.7 or so started talking about the 'seam' between different things.