There is a tnoise checkbox in the more recent versions of the
PDK/Cadence combo I use. I think that setting may not be in
the Ocean script (no Ocean expert here). Might want to set up
a dummy AE window run where you know tnoise works by the
outcome, and Save Ocean Script that you can sift for any missing
switches.
Also find that since tnoise is kind of new, PDK does not have
anything close to proper noise scale factors - some of my
devices need 1000 range scaling to get what we see on the
bench on a time domain 'scope, despite being fitted to
traditional noise measurements and spectral results.