It appears to be a relatively large, survey based, epidemiological study and it may have been logistically near impossible to follow-up for a variety of reasons although mostly funding related (which is the real world like it or not). Informed consent could be relevant by provided information that follow-up would not occur and could provide contact information, hotline numbers, emergency clinic locations, other options on what to do etc.... for individuals who were in emotional distress. The researcher surely agreed to some protocol for this prior to starting the study, but apparently changed his mind. The IRB would have had to be okay with the protocol. So why did he change his mind? Like I said earlier, we do not know the whole story. I am not claiming to know the story, only that I have little information and can think of scenarios where this may not be as egregious as it sounds from the media.
If it was logistically impossible to follow up with everyone that screened positive for potential suicidal ideation, would you recommend simply not studying the population or would you accept a protocol that may not be perfect work acceptable, but within reason given available resources?