The headline is sufficient for those who do not understand how the power grid works, and anyone who knows how the power grid works would not be misled by the headline.
Even though my bill says "100% wind" on it, and somewhere out there are windmill(s) generating as much electricity as my home consumes, the actual power consumed in my house might just as easily come from the coal plants up the highway. It's all on the same grid.
If you understand that, then it's obvious that "Power Every US Home With Renewables" means "Generate As Much Renewable Energy As All Homes Consume". What appears on the bills of those homeowners is irrelevant.