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This requirement might exist to prevent contributors from committing something incompatible with the lowest supported version of PHP to the lock file, thus breaking the "locked" jobs.
Here is a proof that it works: https://github.com/phpDocumentor/guides/actions/runs/7370041293/job/20055989129?pr=793#step:6:105
Note that
composer config --unset platform
is fine to run when when the config option does not exist, so this should not break projects that do not have the option if any.