Expectation for suicide hotline is not "make whoever is sad and calls happy". It is to prevent suicides. He called suicide horline. He was not suicidal at all, he said it to then and to us.

He was not trained away from saying it. The question did not even came straight away. If he is afraid to admit suicidal thought for rational reasons, as you say, rational act is to not call at all.

Way more likely explanation is that they realized he is not suicidal, then asked to confirm and end ended that all.