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The linked article’s key paragraph is this [Google Translate]:
In this regard, the micro-Bo Wang Yang and Sun Changxu two industry experts point out that this is because the touch screen manufacturers in Taiwan’s Wintek bankruptcy, forcing the millet had to turn to other panel suppliers, which greatly affected the millet phone 4 The fourth-quarter 2014 shipments.
In other words, because panel supplier Wintek — which was supplying Xiaomi with screens — went bankrupt, Xiaomi had to scramble to find another supplier and that constrained their ability to manufacture and sell the Mi 4 phone.
It’s plausible. The Mi 4 was their new flagship and initial supplies were constrained.
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