RH8 to Rocky8 migration

Hello, I wanted to do direct migration from RH8 to Rocky8 by migrate2rocky.sh, but this is the error I got:

$ bash ./migrate2rocky.sh -r
migrate2rocky - Begin logging at Wed 16 Mar 2022 04:26:27 PM UTC.

Migration from Katello-modified systems is not supported by migrate2rocky. See the README file for details.

An error occurred while we were attempting to convert your system to Rocky Linux. Your system may be unstable. Script will now exit to prevent possible damage.

 A log of this installation can be found at /var/log/migrate2rocky.log

By reading the README.md, there is this section: Custom replacements of default repositories

Does it mean, that this migration script does not work if we use Satellite repositories and not direct Redhat internet repositories? Or what exactly is meant by Katello-modified systems?

Thank you