"A small percentage"
As I said, it's about 15% to 25%. Making the 95% claim in the article obviously wrong. It's a trivial thing to get right.
Solar will of course turn a higher % into heat than man...
Here's a source: 4% reflected, 96% absorbed. Of the 96, only 20% becomes electricity, the rest is heat.
https://www.pveducation.org/pvcdrom/modules-and-arrays/heat-generation-in-pv-modules
https://www.pveducation.org/pvcdrom/modules-and-arrays/heat-generation-in-pv-modules