Ok, I’ll admit that I learned something today - so that’s a win - but did you even read the article you linked?
The researchers are calling this network of fluid-filled spaces an organ—the interstitium. However, this is an unofficial distinction; for a body part to officially become an organ, a consensus would need to develop around the idea as more researchers study it, Theise told Live Science. The presence of these fluid-filled spaces should also be confirmed by other groups, he added."
So, ya know, it’s not being called an organ by anyone but this group of researchers…