When I worked in aws, this is primarily used to check for permissions of an object. I know how dumb customers can be, for the most part this is used to see why a customer cannot delete a bucket or object those sort of things. I don't remember having ability to see actual customers data only metadata is accessible.
Edit: Based on what I know, I'm pretty sure support will not be able see any of the customers data.
Edit: Based on what I know, I'm pretty sure support will not be able see any of the customers data.