The "free market" takes its course and unionized labor is (sadly) replaced by labor operating in companies with far worse tracks on things that detract from profits like "human rights" or "people not commiting suicide over work" [1]
Every suicide, inside Foxconn or outside, is a tragedy.
But re: implying causation, note that the wikipedia article you cited mentions:
"ABC News[49] and The Economist[50] both conducted comparisons and found that although the number of workplace suicides at Foxconn was large in absolute terms, the suicide rate was actually lower than the overall suicide rate of China[51] or the United States."
https://en.wikipedia.org/wiki/Foxconn_suicides