The interpretation of Fatima and all other ‘approved’ apparitions that it is a private revelation - not required belief for any Catholic.
Which has been thoroughly investigated and declared ‘worthy of belief’, which simply means there is nothing in it that is THEOLOGICALLY or DOCTRINALLY offensive to Catholic faith.
And you still haven’t answered my question - if the apparition were from Satan why would he be telling us to pray the words ‘O my Jesus, forgive us our sins, save us from the fires of Hell, lead all souls to Heaven, especially those who most need Your mercy’ ??