Most references I have found refer to the small intestine.

Leaky gut normally refers to the small intestine.

Hyper permeable bowel, may be something else.

Check with the person who diagnosed you.

The herb agrimony is ideal for this. Purchase dried agrimony. Make an infusion (herbal tea), and drink before each meal.

My friend I am glad you got a diagnosis.
Leaky gut is in the small bowel as far as I know. You have a big list of supplements that can help. I am sure you are taking some of them.
Jorge.