Sometimes that is the best policy, I have had to do that a few times.
Only once returned an item, and the seller must have known too, as he made no fuss about it. It did cost me the return postage.

In the days of yore, crankset included cranks, chainring(s) chainring bolts, complete bottom bracket, crank fixing bolts and dust caps.

Later the bottom bracket got left off the laundry list often.

Today, crank set often means a pair of crank arms!?

The SR terminology error is pretty barrister like. That written, the image must of had some clues? I have seen often Campagnolo crank sets (less bottom bracket) on ebay where one could tell the chainrings (or at least one of them) were replicants.

There is a slow and steady lower common denominator creeping in, kind of goes with the concept of "bicycle" being a bike without pedals. 25 years ago, a bicycle Included pedals.