I’v been using that same filter since November last year & have to agree they are certainly a lot better than the OE pleated paper one.
The K&N cabin air filter does not use oil. It's not like the K&N oil filters which do use oil to assist in trapping particles due to increased porosity/air flow. All you do with the K&N cabin air filter is rinse it with water (can also use K&N clean and refresh products) once a year or so and let it dry before reinstalling it. It's made of non-woven polyurethane and dries fairly fast. I don't know whether if filters better than other products, but it seems to do a decent job. Definitely much sturdier than the typical replaceable filter element. The biggest complaint with these filters is the odor from the rubber gasket. It goes away after a few days. You can also just let the filter sit outside for a day or two before installation.I have a K & N one but haven't installed it yet.
I'll bet the K & N filter voids warranty in some way shape or form being an oiled filter but it's worth a try.