Is there a myth where Hades tries and fails to cheer Persephone up by creating a fake sun in the underworld; and is there a myth where Persephone deliberately helps Aphrodite keep Eros from Psyche because she knows that it will irritate Hades because he ha

Nope. None of that. Exactly zero of those things happened.

I think there was a published novels and a novella on AO3 where the first big happened, maybe a fanfic where those things happened, and loosely at that, but if you look in any sort of mythical canon those stories are 404. The Aphrodite, Eros and Persephone thing I haven’t read at all and likely comes straight from someone’s posterior.

Oh well.

Dumbs will go on dumbin’.

You can’t stop dumb, just inoculate other against it.