The article is from 2009. It presents new roof tiles that become black in winter in order absorb heat from the sun, and white in summer to reflect it. I still can’t buy these as far as I’m aware. What happened to that? They do write
Savings from the black state in winter have yet to be quantified.
So maybe it turned out that it wasn’t worth it compared to tiles that are white year round?
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“the cost and durability has been a serious issue.”
That’s probably where the idea died.
Maybe this question didn’t have the right answer:
The biggest remaining question is over durability, and answering it will require spending some time to do accelerated testing by running the material through repeated hot-cold cycles.