Please make sure that you read and understood https://www.mediawiki.org/wiki/Gerrit/Privilege_policy , and provide all required information:
@holger.knust already has mediawiki group access:
$ ssh gerrit.wikimedia.org -p 29418 gerrit ls-groups --user "'Holger Knust'" | grep -P mediawiki mediawiki-services mediawiki-services-electron-render mediawiki-services-electron-render-deploy mediawiki mediawiki-services-trending-edits mediawiki-services-change-propagation mediawiki-services-change-propagation-deploy mediawiki-php-normal
I see that platform_engineering_team members are all deployers in ops/puppet:admin/data/data.yaml.
So everything seems to be inline to just do it:
$ ssh gerrit.wikimedia.org -p 29418 gerrit ls-groups --user "'Holger Knust'" | grep -cP wmf-deployment 1
Done!