I only see a single disc. I keep looking through the openings in the right side rotor and around the caliper for a shadow effect of the other side and I do not see one.
I agree that it is odd to be right side rotor and single, if it is, but I doubt it is KTM. The caliper is not radial mount and I think, not positive, that on the WP forks without leading axles, axle straight under fork tube, they are usually radial mounted calipers.
Not sure what that fork and wheel are.
it is easier to ask for forgiveness than permission