I dont think they are right about requiring the use of "smart load". This is what I found:
"Zero Export To Load
In this Mode, the hybrid inverter will only provide power to the backup load connection. The hybrid inverter will neither provide power to the home load nor sell power to grid. The built-in CT will detect power flowing back to the grid and will reduce the power of the inverter only to supply the backup load and charge the battery.
Zero Export To CT
The hybrid inverter will not only provide power to the backup load connected but also give power to the home load connected through the distribution board. An external CT will detect whether power is flowing back to the grid. The inverter will then reduce its output power to supply only the loads and charge the battery. If there is insufficient PV and battery power to power the loads, additional power will be taken from the grid. The hybrid inverter will not sell power to grid."