It just links to the overall Google privacy policy, in accordance with Play Store rules mandating privacy policy being easily accessible to users.
The calculator app doesn’t request any permissions which you can check in settings
Alas, no permissions doesn’t fully mean no privacy intrusion/violation. For example, system permissions are not needed to track how many times you calculate 8008135, and upload that statistic together with your IP address to a public website.
But basic internet permission is given to all apps without asking. Network permission allows things like talking on lan on other ports.
To send data home only the general internet permission that every app has is needed. E.g. you ‘download’ an ‘image’ from https://stupidcompany.com/userbob/8008137_210x_in_24h/alsoclearlynot1337
