say something, but how does the 'speaking' pilot know what and when to say something if they too are suffering the effects of illusion? Is the call correct or incorrect, who can decide?
If the issue concerns the content of the call, then I agree that only the inappropriate condition should be called, and that this should include information of how to recover.
This also raises the question of the experience required to judge non-annunciated situations requiring verbal intervention. Would a novice pilot's erroneous perception conflict with the more experienced pilot's correct perception; who is the better monitor.
Also see the problems of perception vs role, where with increasing calls and procedures the PM may be concentrating on the 'primary' task to check modes and make status calls, such that there is little flight path monitoring or spare mental resource to make an alerting calls.
Do You See What I See? Effects of Crew Position on Interpretation of Flight Problems.