It makes sense that the rotor is worn like that on both sides. If the rotor is leaning out (relative to the caliper) then its going to wear more on the side its leaning towards.
Check the bearing runout, and then check the slider pins on the caliper. Besides the rotor not sitting on the hub perfectly flat there is little else it can be...well maybe a piston thats not centered but I've never disassembled a 240 caliper.
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