I don't see how in the posted schematic it balances the load current.
As I said above, they are inherently self-balancing - AS LONG AS YOU CHOOSE THE CORRECT DEVICES - I've no idea if the specific ones mentioned are or not. But as long as Rds increases as the device gets warmer, then they will balance - just as balancing resistors work. If you choose to use devices where Rds decreases as it gets warmer, then you MUST use balancing resistors.
However, as it's a circuit just 'scribbled' on apiece of paper, you never know what might or might not be used - if in doubt stick a low value resistor (0.1ohm?) in each source connection.