Welcome to the tree!
OK, I could be entirely wrong. But looking at the picture of those nappies, they seem to be pockets and not AIOs. (If you blow the picture up and look at the back of the orange nappy, I think you can see that there's an opening there.) Looking at the listing, there's no insert included with the nappy; so you're paying just for the shells and nothing absorbent. It's probably worth emailing the seller and asking for clarification of what the listing is actually for - AIO or pocket and, if pocket, whether an insert is included. They are exceptionally cheap and this could be why. Or, of course, I might be talking rubbish.