Sh. ʿUthaymīn, may Allāh have mercy upon him, was asked about mentioning individuals by name, the evil deeds they used to do, and how Allāh dealt with them, and whether that falls under backbiting.

He, may Allāh have mercy upon him, replied:

“Yes, mentioning the dead with respect to their evil deeds was prohibited by the Messenger, upon him be praise and protection, for he said, ‘Do not speak badly of the dead, for they have reached the result of what they have sent forth.’ [al-Bukhārī (1329)]. Rather, pardon and forgiveness is sought from Allāh for them, it may be that his supplication is answered for them, thereby Allāh forgives them and pardons them. As for mentioning their evil deeds, then they are to be mentioned in an unspecified manner, so it is said, for example, in warning against interest, ‘Have you not seen people who violated the prohibitions of Allāh and they engaged in dealing with interest, then they departed from this worldly life and none of their wealth was buried with them, rather they left it behind for others, thus the spoil is for others and the loss is for them?’ and what is similar to that by which the living can take heed, as for mentioning him specifically, then this is not permissible.”

Fatāwá Nūr ʿalá al-Darb (12: 487, no. 6679).