Katello 4.0 drops Pulp 2 in favor of Pulp 3 completely. If this plugin is used, then Pulpcore will be used and the user can decide if it should be deployed as a mirror configuration or not. This drops most of the parameters as they are not relevant with Pulp 3.
Related issues
Feature #32239: Support smart_proxy_pulp 3.0.0 which drops Pulp 2 features
Added by Eric Helms about 3 years ago
Fixes #32239: Update Pulp plugin to drop Pulp 2
Katello 4.0 drops Pulp 2 in favor of Pulp 3 completely. If this
plugin is used, then Pulpcore will be used and the user can decide
if it should be deployed as a mirror configuration or not. This drops
most of the parameters as they are not relevant with Pulp 3.