It raises the question: can a colony of individual animals (zooids in this case) that work cooperatively be called a singular animal itself? I think biologists say yes, but it’s an interesting taxonomic boundary.
AFAIK, a "super-organism" composed of individual entities is defined as one where the long-term fitness interests of those individuals and their groups are completely and permanently aligned.
For example an ant colony is a super-organism. That’s why it makes sense for a soldier ant to die for her queen.
Some of the "entities" aren't aligned always, like when a person is pregnant for example. I think also our (human) cells doesn't operate as semi-autonomous agents with independent nervous systems and agency, unlike a ant colony.
We think cows are singular animals, despite being made up of lots of different organisms with different DNA. (Much of the diversity happening in the gut.)
For example an ant colony is a super-organism. That’s why it makes sense for a soldier ant to die for her queen.