Doesn't look like a screenshot of a 6+ in that article. The battery/clock/signal are all very big and take up a lot of real estate that they do not on the 6+ shots we have seen.
That actually looks like it could be a 5/5S when you think about the scale of the item at the top vs the overall screenshot size.
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Yep, that Phonearena screenshot showing 1GB RAM is actually a screenshot of a 5S...I layered a screenshot from 5S over the phone arena screenshot and the sizing of the clock, battery and signal are the same and so are their positions on the screen.

Thus, I'm not buying that article either!
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To take a Step further I layered the 6+ screenshot from Apple's site over the screenshot in the phone arena and it proves my point that the screenshot we see in the PA article is not a 6 Plus. See below:
