The damper looks like the original factory item and, to me, appears to have underseal overspray on it.
If the OE item and 11 years old, it will be well past its best.
I have not used KONI on my 2014 4/4. I used AVO adjustable the first time I changed them & they were OK. Last year, I upgraded the front end to the SSL system with matching dampers on the rear.
You have options for replacements.
Some folks speak very highly of these:
https://www.wolfperformance.co.uk/product/wolf-adjustable-dampers/Or, you can upgrade to the SSL system at the front (as I did)
https://www.librands.co.uk/products-view-156.htmlPlus complementary dampers on the rear:
https://www.librands.co.uk/products-view-215.htmlThere is also the option of a 5 link setup at the rear:
https://www.librands.co.uk/products-view-214.html