@zotheca als Admin der stummschaltenden Instanz kannst Du laut Doku wohl in der config aus der einseitigen Suspension auch einen harten Block machen:
> "Note that by default, users of a suspended server will still be able to view posts from the suspending server. To change this default behavior, server admins can set the AUTHORIZED_FETCH environment variable - see the documentation for configuring your environment."
https://docs.joinmastodon.org/admin/moderation/#:~:text=Note%20that%20by%20default%2C%20users%20of%20a%20suspended%20server%20will%20still%20be%20able%20to%20view%20posts%20from%20the%20suspending%20server.%20To%20change%20this%20default%20behavior%2C%20server%20admins%20can%20set%20the%20AUTHORIZED_FETCH%20environment%20variable%20%2D%20see%20the%20documentation%20for%20configuring%20your%20environment.