The phrases فَلَيْسَ مِنَّا and وَلْيَتَبَوَّأْ مَقْعَدَهُ مِنَ النَّارِ convey the gravity of a wrongful claim. Such warnings must not be used to decide the ultimate fate of an individual.
A practical way to put things right is to withdraw the false claim, restore the legitimate owner’s right, correct misinformation, and repent. A verbal apology alone does not restore property or other rights still withheld.