Did you actually read the article?
It's a bait-and-switch. At the very least, it's misleading.
The thesis of the article seems to be that some studies of SSRIs and SNRIs have been performed poorly, with suicide data being coded incorrectly: "misreporting of trial data [is] a growing problem," and "...some clinical trials have been misreported or poorly designed." Beyond some thin anecdotes, the headline "Antidepressants can raise the risk of suicide" isn't even addressed, nor does it link directly to this "largest study" so I'm a bit hard up to learn more here.
The only relevant sentence from this piece (that doesn't actually draw a connection between suicide and under 18) is "NHS guidelines state that under 18s should not be given antidepressants, [despite this] there are more than 100,000 prescriptions for Prozac each year for teenagers, despite reviews showing that the drugs are no more effective than counselling." That's not really a clear link to an increase in suicides. I can't find any mention of quantifiable increase in suicides in this article. Did I miss it?
We have to be careful not to get lost in causation. Just because a lot more people are taking antidepressants, and we highlight some people who have taken their lives while on these drugs, doesn't mean that the drugs are responsible. I'm not surprised that some studies have been performed poorly, but that's not a clear indictment of the drug's risk.