Because they don't actually want to sell any, but they'd like to stop all the bad press that Toyota is actively lobbying governments against EVs adoption to prop up their very profitable ICE engine cars.
There's another reason, which goes back to the early days of Japanese consumer products being exported.
It's simple, they make up a model name which looks like a code but if you say it in English it sounds like a word. The word is usually sales orientated, so attaches meaning in a relevant or attractive way.
So this EV is called the Breezy Sea - BZ3.
My camera is made by Fujifilm and it's called the X-E1 - Sexy One.
Everybody replying to give me logical thought out answers is not addressing the real problem of why would Toyota name their cars such an awful, forgettable key-mash of a name.