The variable `wgContentTranslationPublishRequirements` should define the user rights which users would have permission to save the translated articles directly to main namespace (i.e., in Wikipedia to article namespace). Setting is defined in [[ https://github.com/wikimedia/operations-mediawiki-config/blob/master/wmf-config/InitialiseSettings.php#L8323 | InitialiseSettings.php ]]
For example, in Finnish Wikipedia we added the requirement for autoreview on Jun 8, 2023 (see phab T337412). However, there are still continuous hits in the [[ https://fi.wikipedia.org/w/index.php?title=Toiminnot:Väärinkäyttöloki&wpSearchFilter=180
https://quarry.wmcloud.org/query/94346 | abusefilter log ]] from new users who are trying to save pages to article namespace. We noticed this as there were also translations from mobile users without the autoreview right which didn't match the abusefilter rule and were saved to article namespace. (see [[ https://quarry.wmcloud.org/query/94346 | quarry 94346 ]]) Similarly, in English Wikipedia there are hits to [[ https://en.wikipedia.org/w/index.php?title=Special:AbuseLog&wpSearchFilter=782 | abusefilter ]].