Follow the headline link, take a look at the chart. Note the market share rankings. Samsung steadily falling, Apple makes a big gain in that last quarter.

From the TrendForce report:

Samsung is expected to slightly scale back the production of its high-end models in the fourth quarter as the brand is seeing the sales of its smartphones being squeezed by the strong demand for Apple’s latest iPhone devices.

And:

As for highly anticipated iPhone X, the yield rates of its key components (e.g. Wi-Fi modules and 3D sensing modules) have been lower than expected, thus delaying production of the device. With the limited support from iPhone X, Apple was not able to significantly raise its total volume.

On the other hand, TrendForce estimates that the iPhone production volume for this fourth quarter will reach 81 million units with iPhone X accounting for 33% of the total. TrendForce expects a surge of iPhone X production that will last through the first half of 2018.

If the limited component yield rates comment is true, Apple was able to make this leap while a bit hamstrung, which would mean this surge in production (and in demand) will last longer.

Good news for Apple all the way around.