That could work also, but not all shops have carts, and people don’t always need a basket. It’s common enough to scan things and pop them directly into a bag you brought, skipping the need for a basket altogether.

It was more accurately described as computer vision at the time, but your memory is right. They wanted to get to 5% of sales being human reviewed, but it was more like 70%.

What’s funny about Amazon’s efforts for Just Walk Out is that checkout free shopping already existed. Simply by letting customers carry a handheld scanner and payment terminal around the store with them.