Lets say an AppleID is created with the iCloud email address somebdy@icloud.com (misspelled).
Is there any way to correct the iCloud email to somebody@icloud.com? Creating a new AppleID would lose old purchases and is not an option.
Is iCloud permanently linked to an AppleID? Is there a way to change the @icloud.com address?
According to this Apple support article, renaming the iCloud/AppleID prefix is possible as long as it is not an @mac.com or @me.com (quoted from link).
However, when I follow the instructions, I only see an option to add a new primary email, I don't see the same screen as in the last illustration in that article.
Apple's screenshot:

My screenshot:
