If the reviewer simply looked at the app description or opened the app they would have that context. Not hard. Just laziness.

How much time do you think the lowly non-Apple employee contractors get for reviewing each app?

That would be a valid reason to criticize Apple.

Doesn't Apple try to justify their 30% revenue cut by saying they offer unparalleled curation services in their app store?

This is an example of such an unparalleled curation service. The app makers are just lucky enough to be popular (and even promoted by another arm of Apple) or they'd still be out of the app store.

The text is not for the reviewer, it's for the user of the app.

Imagine the ridiculous level of explanatory humdrum apps would need to conjure if they were to explain themselves to uninterested people pressed for time like that reviewer you described?

It shouldn't be the developer's burden to ensure that the reviewer is operating above the reading level of a toddler. I am sorry that your boss apparently cannot, but that's not justification for all industries to operate that way. The purpose of a camera app is to take photographs. A user who downloads a camera app probably wants to use it to take photographs. This is something a child can understand. If I have to hold the reviewer's hand and explain what a camera is, I severely question whether that reviewer is qualified to be doing that job.

In my painful and long experience, that mindset just doesn't work if you're trying to become a more effective communicator and save yourself time in the long run.