The diagram in this article showing direct energy flow from photovoltaic cells to a car battery contrasted with a complex hydrogen production and distribution cycle is a wishful thinking and false advertising. The typical charging scenario is a Tesla hooked up to 150 kW Supercharger. You would need about 8,000 sq ft of PV panels and a sunny day to pull it off. Most of the time there is a big power plant on the other end of a transmission line, sometimes adorned with a few smokestacks.
This is comparing the same energy source . For example I have solar at home and charge my Tesla at home and the diagram makes sense even though I am still connected to grid. During day I supply grid and at night I use grid and net energy use cancels out
