This chart is deceiving in so many ways that it makes you wonder if there is a deliberate effort to confuse people.
Here are some pertinent questions:
1. That amount of land is supposed to cover all our energy needs or only the electric ones?
2. Does that amount of land include the space needed for the pairing fossil fuel power plants (to supply power at night or during cloudy days)?
3. If no pairing fossil fuel plants are being considered, then, does that area include the massive storage capability that would be needed (banks of industrial batteries, lakes, etc.).
4. Is the area needed by the inverters and transmission lines already included?
5. And probably the most important of all: do those areas include the massive mining / manufacturing / assembly operations required for such a solar PV build-up and for the regular replacement of all the components in this global system?
6. Let's not forget that also massive amounts of transportation / construction equipment would be required for that build-up: ships, trucks, cranes, forklifts, etc., etc., and all this equipment needs space to be build (and mining operations to obtain the raw materials).
Some renewable promoters bend backward in such awkward and painful positions to try to justify the unjustifiable that the word that comes to my mind is: dishonesty.
Maybe I'm wrong and they are just overeager.