As a builder I've roughed-in basement baths. What rough-in included was all the piping and venting to where the fixtures could be located. I wouldn't consider an injector pump to be part of a rough-in, though that could have been spelled out more clearly.

As a Plumber I can tell you first hand that it makes perfect sense to install the under slab piping, ejector vessel pit and the dedicated vent during the rough in stage but it would be foolish to install the sewage ejector pump until it is actually needed.

Keep in mind that sewage ejector pumps are very expensive and the warranty clock starts ticking as soon as its installed. It would be a shame to install the pump during the rough in then 2 or 3 years later when they get around to finishing the bathroom they discover the pump has seized up and there is no warranty.

Nope. I wouldn't expect an ejector pump to be included in a "rough-in" any more than I would a faucet or toilet.