Well Im no genius but the video shows a 3.6 ltr which has a totally different method of coupling the cam to the crank -chain vs belt so the noise you are hearing might not been the same issue as this video shows.Like many have said why buy it?
Maybe you shouldn't have purchased an abused vehicle?
Sounds like it wasn't that well cared for hope things work out in your favor
I'm pretty sure AWD Journeys need all the same size tires good luck