what do "formless contexts" have do do with liberation & nirodha?
the suttas have explained the formless contexts are not states of liberation; instead, they are conditioned states
That is not the point here. We are not discussing whether or not nirodha samapatti is liberation. We are discussing when nirodha is used in some contexts like "sańńā-vedayita-nirodha", if appeasement is the best translation. Imo, non-arising is the best in that context.