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The article addresses this and notes that most of the cost reductions we've seen in the past decade are only really applicable to utility-scale installations, as it's only then that the one-time costs can be amortized sufficiently. Small consumer installations are dominated by costs other than the panels themselves to a much greater degree than utility-scale installations.

Well, according to at least one online calculator, $1 in 2014 in the US would be worth $1.33 today. So perhaps the real price has gone down by over 33%?

This seems extremely sus. Maybe the 10kw include battery today?