Windows server2008R2 domain controller downgrade official document

The system that was originally the domain control server in my company was windows server2008R2. This year I migrated the domain control to the Windows 2022 server, and it ran normally.

Now I need to downgrade this Windows Server 2008R2 domain controller. I have seen this tutorial，

How to migrate Active Directory from Windows Server 2008 R2 to Windows Server 2022 (microsoft.com).

But managers believe that official documents are needed, such as：https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/deploy/demoting-domain-controllers-and-domains--level-200-。

But this is not about Windows Server 2008R2. I have been looking for it for a long time but couldn't find it. So I come here to ask for help. Thank you.