Does anyone know if Smith is going to be in the 11 for the 4th Test? I need to do a multibet but before I do, I need to know Smith is there. If Smith is playing then Australia is going to win easily.
Yes. Steve Smith will be part of the playing XI for the 4th test. You can check this:
https://www.espncricinfo.com/series/18659/scorecard/1169534/derbyshire-vs-australians-tour-match-australia-in-eng-2019
He is currently part of the playing XI in the warm up match against Derbyshire. So in all probability, he will be playing in the 4th test. But I think you are a bit overoptimistic when you say that Australia is going to win "easily" if Smith makes it to the playing XI. From what I have seen, one-man armies are not very efficient in winning the matches on a constant basis (Kohli is another example). Cricket is a team sport and you need at least some support from the remaining 10 players to win the game.