"The hermetically-sealed, climate- controlled indoor growing facilities provide shelter from the elements, weeds, insects and pests which eliminates the need for harmful herbicides and pesticides whilst providing safe, dependable and nutritious food."
As you say, they also have a JV with Amfil & their organically approved Gro3 ozone based system. I'm just guessing, but I'd say they'll just use the hermetically sealed rooms. I don't believe they are airtight as such, more controlled with pressure & the use of filters for incoming air. The machines are fully automated with video & don't need humans to enter the rooms.
I see in news today, Aldi are stepping up their organic food lines and taking aim at Woolies & Coles organic lines. This competition can only be good for rotogro.