Read-Only custom post type

You are correct that the read capability is intended for the frontend. The capability you’re looking for does not exist.

Additionally, if it did exist ( which it does not ), the WP Admin user interface does not provide a UI for viewing/reading posts, only addition and editing.

If you want it, I’m afraid you have to take the following steps:

  • Add a new capability, and add it to the relevant roles
  • Remove the standard WP access to those custom post types for those roles
  • Implement a UI from scratch, including a listing screen, and an option page for viewing the items

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