Yes, static initialization blocks are kind of lazy initializers. They will execute when static methods are called or there is a reference to the class.

Just in most of generally thinking, lazy initializer looks like

public static Instance getInstance() { 
    if (instance == null) {
        instance = new Instance();
    }
}

we don’t hit upon static initialization block.

We might just load the class first but use instantiated object later, or never. (but I know this case is much rare.)