As observed by earlier posters, Austin's suicide bait language is always centered around "I want to die!", "I hate my life!", or "My life is trash!" which express his emotions without intent of action. His most actionable statement has been the vague "I'm going to do something stupid," which has never been delivered with the necessary conviction. He's just fishing for juice.
I won't say that he's mentally secure against a potentially extreme feltening, but none of his previous statements strike me as legitimately suicidal.