They talk about three words and it’s pretty meaningless:

This is the word most commonly used mistranslated in the New Testament as “hell.”

Just because people use a word that doesn’t mean it’s used accurately. See previous comments about how hell is a later mistranslation.

This is the name of the Greek god of the underworld… it appears to mean a grave

Ok. Irrelevant.

Here one finds Tantalus, Sisyphus, and others enduring such fates.

This word from greek mythology appears only once in book of Peter. Never mentioned by Jesus.