Aphobia
They called their phobia "not-phobia"?
It follows conventions. "Homophobia" is an equally stupid word according to your logic, as it means "phobia of things that are the same" or something like that when the latin is interpreted literally. "Biphobia" would mean "fear of things there are two of" - a rather crippling condition, to say the least.
In fact: "Claustrophobia" - fear of locks. "Agoraphobia" - fear of markets.
The logical conclusion here is that the learning of Latin should be banned, and the etymologists hunted, so that people no longer object to perfectly functional words.
Phobias should actually be named in greek, not latin. They are named after the servanth of Ares, Phobos (Φόβος). The latin variant is Terror.
Latin for market: "forum". "Agoras" is greek
"Homo-" just happens to be taken from greek in latin. But in latin, it also means "human" (the word "human" is taken from latin to english).
"Bi-" is greek for double. In latin, it would be "di-".
But I agree that most of these phobia names are stupid. They just took the prefix for the orientation and put it in the phobia's name.
"to close" translates (by google translate) to "na kleíso" (να κλείσω), which may be the basis for "klaustrophobia", or fear of being closed.
"Okay boys, it's open season on the etymologists. Who's first on the list?"
I am second, apparently.