Interesting, but misleading. Mental health professionals in New York are required, under the NYSafe Act, to report any individual (whether they have a gun or not) who, in the professional judgement of the practitioner, presents imminent risk to themselves or others. There is nothing about taking antidepressants in the law or the state's guidance.
This is taken from the guidance on the NY Govt. web site:
"The standard “likelihood to result in serious harm” means threats of, or attempts at, suicide/serious bodily harm to self, or homicidal/violent behavior towards others.1 This standard justifies the need for immediate action, as a public safety measure, to prevent harm. Mental health professionals must use reasonable professional judgment when making this determination.
In general, a MHL 9.46 report would originate if the clinician determines the person is likely to engage in conduct that could seriously harm the patient and/or others (which could thus also trigger a MHL 9.45 emergency assessment). It is not, however, necessary to establish that the patient has a gun before making the report."