This is correct.

"Hey are you working on that deck?"

"Yeah, I just need to run to Home Depot and get some more nails"

A deck is that wooden structure on the back of your house. A power point presentation is an electronic file made up of "slides". There is also a "deck of cards", but no one calls a deck of cards just a "deck". Maybe if they called it a "deck of slides", or you know just use a term that makes sense, like "presentation".

No one knows what the hell you are talking about with the word "deck."

It comes from "slide decks", because not too far long ago, presentations were made with actual 35mm transparencies which were slid into a projector, and were carried in decks.