Cynical me, here.
When they discontinue this dumb feature in 5 years and stop making the juice (as iRobot did with the original Scooba Juice), then one will have a non-functional button system on the tank which, 40 years from now, will be a question on this forum...
Why do I think the feature is dumb? Because this can work no better than spraying Clorox Toilet Bowl cleaner in the toilet and flushing without brushing. Which doesn't do much. So neither will this.
The video kind of falsely suggests that a bowl full of water will swirl and swirl and swirl, as if pumped around and around, but all you get is the regular 1.28 flush, except with some cleaner in the flush, and a follow-up flush later.