.....an article that used the term "wing Inertia" as the opposite force from lift.
I haven't read that article but the way you wrote your part of the post in quotes doesn't make sense. The inertia of the wing is not directly related to the lift of the wing. And it's not accurate to say that inertia is the opposite of lift.
Both light and heavy wings will make the same lift if of the same size and same angle of attack. But the heavy wing has more "inertia" that resists changes in rolling. So it takes more control input to force a heavy wing into a given roll rate or to stop the rolling compared to a light wing. And a heavy wing will tend to not be as affected by turbulence than a lighter wing. By the same token though when a heavy wing IS disturbed it will require more rolling force to correct the disturbance.