It truly has one hole, in that it eats, has a digestive sack, and then vomits the poop
If the hole doesn’t go through, it is only a pocket, typographically identical to a plate.
*topologically

maybe they meant

O

As in “topographically”, which specifically refers to land surfaces?
I know. I was joking. It’s a visual pun on how a feeding tube of the creature, a dinner plate and the capital O would look similar- hence typographical.