The Akiza deck has 2 copies of Lord Poison as well, which is also not currently possible. I don't think the decks were meant to be taken literally. (Similar to that Zane deck in the past that had Cyber Dragon and Cyber Twin Dragon.) It's just designed to show off Akiza at events.
Zane's Cyber Dragon deck is at least playable at the event.
The one for 5Ds characters at TGS 2018 seems to be not playable, and just a bunch of images on a paper, so they're more like a suggestion than for showing off.