What is the point of ‘git submodule init’?

Reading the git submodule documentation, there is a use-case that ostensibly justifies the existence of git submodule init as a standalone command.

If a user who has cloned a repository wishes to use a different URL for a submodule than is specified by the upstream repository, then that user can:

git submodule init
vim .git/config # Alter submodule URL as desired, without changing .gitmodules
                # or polluting history.
git submodule update

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