This is not true. Worldwide, typically about 80% of the energy used to charge EVs globally comes from a private connection. And the vast majority of that energy is drawn from the grid off-peak when transmission systems etc. are underutilized. You article reflects a mindset that envisages EVs working like ICE based transport.
I'm a small step away from going off-grid again, the biggest stumbling block is that - predictably - you can't do any practical small power windmill installations. I've considered a windlass in the basement but my kids wouldn't hear of it ;)