Reading is not my strong suit. The 2.0T Theta II is also timing chain, and I'm going to *assume* the SmartStream 2.5 is as well. As far as I know, Hyundai/Kia does not make a gasoline engine with a timing belt at the moment.
A chain that needs replaced is determined when you can no longer set cam timing within spec due to excessive stretch. The tensioner could then max out as well allowing all sorts of slop leading to noise and possibly failure. A chain could/should last the life of an engine.
I’ve never done timing on a VVTI cam, I wonder if it’s even necessary and simply self correcting.