Is it necessary to measure 1dB power compression point for a Class E power amp?

I am simulating a Class E RF Power Amplifier in Cadence Virtuoso Spectre. I am just wondering that if it is normal to measure 1dB power compression point of a non linear (switching) power amp like Class E? Why?

If yes, then I am not sure if I set up the PSS analysis right. Could you please check it right below? (433MHz is the operating frequency of the PA)

Please check the direct plot form as well right below. Thanks.