It seems there could be some issue on the method simulator follows to calculate the pole. I tried by myself and found a good match between hand calculation and simulator output. Here's using tsmc 180nm tech, I had to 'mimic' your TB. Therefore I used a bit more width than that of you.
and the preparation of TB with stimuli and declared variables-
Here I did basic DC analysis and the AC to check the poles, Here's the DC results-
As you can see the gm is about 1.31m, output impedance of (1k||14.5k) sets a dc gain of 1.7 dB.
As the gate Cap is quite low for this size, around 4fF, with used Ri = 100, it gives a input pole of 398 GHz. Besides the sim says-
Notice that there is no drop through input Ri, hence the dc gain in this input node is 0 dB.
As the load is 1pF, the other cap on this node 'quite' ignoble for handcalc, with output impedance = 0.95k, it gives a input pole of 168 MHz. Besides the sim says-
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Hope this helps!