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Hello,
Thank you for reporting this problem!

I have updated both RHEL 8 and RHEL 9 documents to reflect the fact that only incremental upgrade is supported.

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/deploying_different_types_of_servers/using-databases#fast-upgrade-using-the-pg_upgrade-tool_migrating-to-a-rhel-8-version-of-postgresql
You can use this method for migrating data:
    From the RHEL 7 system version of PostgreSQL 9.2 to the RHEL 8 version of PostgreSQL 10
    From the RHEL 8 version of PostgreSQL 10 to the RHEL 8 version of PostgreSQL 12
    From the RHEL 8 version of PostgreSQL 12 to the RHEL 8 version of PostgreSQL 13
    From the RHEL 8 version of PostgreSQL 13 to the RHEL 8 version of PostgreSQL 15 

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html/configuring_and_using_database_servers/using-postgresql_configuring-and-using-database-servers#fast-upgrade-using-the-pg_upgrade-tool_migrating-to-a-rhel-9-version-of-postgresql
You can use this method for migrating data:
    From the RHEL 8 version of PostgreSQL 12 to the RHEL 9 version of PostgreSQL 13
    From the RHEL 8 version of PostgreSQL 13 to the RHEL 9 version of PostgreSQL 13 or PostgreSQL 15
    From the RHEL 8 version of PostgreSQL 15 to the RHEL 9 version of PostgreSQL 15
    From the RHEL 9 version of PostgreSQL 13 to the RHEL 9 version of PostgreSQL 15