If Chapter 967 is the full extent of what Oden wrote about Laugh Tale then there is no shortcut there. Especially considering the Straw Hats already took a huge shortcut by learning about the Road Poneglyphs on Zou and not on Lodestar Island like you're supposed to.
That's not what a Deus Ex Machina is. Why do people keep using it wrong?
I don't think what we saw in ch 967 is everything in Oden's journal. Maybe there is more… a clue or something about the final puzzle at Laughtale, or even a full-on walkthrough to reach One Piece. That's why Kaido seeks it, no?
As for deus ex, imagine this one thing. Someone that was never foreshadowed before, suddenly appears very conveniently on a part of story when they're very much needed, and bringing with them an ability to help the protagonists defeat a villain. Maybe their ability is a direct counter to the villain's ability... or they know the villain's weaknesses...