I don't think the Quality Assurance in Japan have anything to do with:
- English shop description.
- Checking screenshots that are shared.

These are basic things the person writing it are normally going to catch. But realistically, they copy+paste stuff just like we would. I've caught evidence of them copy+pasting old patch notes and forgetting to change it, for example. Probably if any of us did that for 10 years we'd eventually forget to change a tomestone name or something.

Quality Assurance job is to actually find bugs within the game itself.