Apple's answer is below this line.
Some screenshots are always required. Even though your app will not run on those devices, it will still be displayed and just say it is not downloadable on that device. Also, 5.5 screenshots are used for scaling up and down depending on the users device and what screenshots the developer has or has not provided. For a list of required screenshots, you can visit the link below:
https://developer.apple.com/help/app-store-connect/reference/screenshot-specifications
Topic:
App Store Distribution & Marketing
SubTopic:
App Store Connect
Tags: