I think all they needed for the pic of the car on the balcony is the visible body panels and the wheels and some bracing. Or, they could trust the balcony to hold the whole 2300 pounds.
Under modern building codes a balcony or deck is required to support from 60 to 100 pounds per square foot uniform load. The only problem would be in how the load is distributed. That balcony should be about 6' by 16 to 18' and would support 5760 pounds to 6480 pounds.