wordpress-AutoUpdater is what I would like to test, I think if you upgrade an existing installation, we do not modify files nor mysql databse, so we could downgrade if you want to go back with wordpress 5.1.1. However the wordpress-AutoUpdater will conflict with worpdress because they use the same path to files, so you must remove it manually then downgrade to the nethserver-wordpress of my repository
so in short after tested the new wordpress-AutoUpdater, if you want to downgrade
rpm -e --nodeps wordpress-AutoUpdater
yum downgrade nethserver-wordpress --enablerepo=stephdl