My mom raised all three of us (children) with just prefold cloth diapers in Korea. There was no diaper covers. No fasteners. From the picture, what I see is just prefold diaper and rubber band around our waist to hold the diaper.
My mom handwashed all the diapers (no laundry machine back then). She boiled them in the hot water to sanitize/remove stains. Sun dried all the cloth diapers.
My grandmother lived with us and she potty trained us by one year. More like EC. I remember we had a little potty in our room (not in the bathroom). And the potty was simply a metal bowl. Whenever we had to go, my grandmother simply placed the bowl under us. (we didn't go to the potty, she knew when we had to go and simply brought the bowl to us) All Korean caregivers make certain sound (sheeeeeee) like a S sound (which is similar to sound of the water running) whenever young children go to potty. It helps to associate the sound and need to go pee.
My cousin was potty trained by 6 months and my aunt tells me that she did not wet the bed at night!
None of the Korean houses had carpet. All hardwood or something similar to hardwood covered with paper-like/oil-like covering. So, there was no need to worry if babies accidently wet the floor. Simply wipe and clean.