Hydrogen vs. Battery Electric Cars

6:54 - the graph is from 2009. The battery tech and efficiency have evolved over time. I mean, the first Tesla Model 3 LR RWD could do 600km. While now, the Model 3 LR AWD which was less efficient can also do the same amount of distance.
The SR+ did have about 350km at first but now it has about 440km WLTP-Range, from the same battery size (55kWh).
Not to say the Mercedes EQS or the old Hyundai Ioniq which was well known for it's good efficiency.
So, my question is, what powertrain efficiency was that graph based on? The Tesla Model 3 which is just below 300miles of range weighs 1611kgs. Even with the EPA-Range of 263 Miles, the car should weigh about 2 tons, but it weighs 389kgs less.