They will perform the same as other polarizers, the only difference is that if you are flying 90 degrees to the sun and want to reduce polarization, you can't really (assuming it's set at max which it probably is). Even if you had a rotating filter you would have to do that on the ground anyway.
On their own, they only perform like ND filters in the sense that most CPLs cut 1-2 stops of light. The ones you linked to though are NDPL's which have a set amount of ND built in. With any polarizer, not just the ones you have, if you change the angle to the sun while flying you are going to get uneven footage - it's up to you if that would ruin it or not but for most people it does when there is a dramatic change. A rotating element doesn't change this.
As I said earlier, NDPL's are not something you use like a ND filter or just leave on your drone - they would only be for specific scenarios with a well planned flight path at a predetermined angle to the sun. If you want to just fly around and not worry about as much, you want regular ND's.