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ADL5565 Common-mode Rejection Ratio

The data sheet shows common-mode rejection ratio on page 14, figure 24 as 57 dB at 1GHz.

Using the s-parameters given for the device shows a common mode gain of  approx -32 dB in the 6 dB gain configuration at 1GHz.  The same simulation shows approx. 6 dB of differential gain, so I believe the simulation is set-up correctly.

How was the common-mode rejection ratio measured?  Can I expect CMRR around 57 dB at 1GHz?  I will be using the device in a circuit that will have a significant common-mode RF signal that I want to reject.