Brian, EXR Modes operates on sensor and are hardware methods to control DR or Higher ISO noise. Its not like Nikon or Sony's different in-camera processing for image enhancement. If it would be the case, no one should be complaining.Since they're testing the sensor and not the final output of the camera, I'm pretty sure they are NOT using EXR mode. I think EXR mode would be considered in-camera processing..
Truely, DXOMark scoring is wierd. Their numbers goes up and down too quickly. They are the only one who are testing sensor output, so no one is here to challenge it. Their methods are still kept secret (more or less) and not exaplined well, not like other review sites, those go through images in RAW and JPEGS and tries to prove their points. Also they delay their test results (for few manufacturers, specially fujifilm) so much, that mostly manufacturers by that times announced their next product line.I don't look at DXOmark all that often, I dont get their scoring.