I believe it is a raw measurement.(?) Maybe smoothed a little? The attached graph is from my 2021 LCD-XC. As you can see it is measured with the Neumann KU 100 during the QC stage prior to burn in and shipping. Although my understanding (from the Audeze discord) is that they are updating their measurement rig soon. I have always used these Audeze graphs to EQ my LCD’s with great results. Even though the 2021 does not ‘require’ EQ, every headphone can see benefits from EQ. For my taste the 2021 needs a +6 DB bass shelf.
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