Yeah, if I use it (or "previously mentioned" / "previously discussed"), it's because I know there's context from a previous discussion that at least some participants won't read without me calling out to them that they need to.

Yeah, using it in speech is weird.

B: 'Getting a drink, need anything?'

A: 'Could you bring me a quarter-inch ratchet?'

B: 'Sure, be right back.'

B leaves the room, returns with a glass of water but no ratchet

A: 'Um, where is it?'

B: 'Huh?'

A: 'The aforementioned tool?!'

B: 'Oh, right, spaced it... wait, "aforementioned"?'