cant dx schizophrenia without more info. all we can identify is a few reported symptoms from a third party. the secret messages are called Loose Associations and that with the persistence of belief in the face of evidence to the contrary indicates a delusional belief, but those can occur in several psychotic disorders. for schizophrenia we'd at least need to confirm two out of three of bizarre motor activity, disorganized speech, and preferably some negative (withdrawing) symptoms like flat affect, avolition, etc