If someone decides to use an online tool to view Instagram profiles without being detected, what specific types of content and information actually become accessible, such as private posts, archived stories, full followers and following lists, hidden tagged photos, comments on posts, and even media that the user has deleted, and how does the entire process technically work behind the scenes to keep the viewer completely invisible while gathering all this data without ever alerting the account owner or requiring the viewer to have their own Instagram account or login credentials?