Unpredictable positive events usually just don't get attention. Something good just happened, okay, that's good. People just don't pay attention.
Technically black swan might not be negative, but for all practical reasons, "black swan event" is what people call impactful unpredictable negative events and they expect those events to be negative. In other words, it is a synonym for "a disaster" of sorts, only "economical".
This is how an economist would call a disaster.
they do get attention, but generally people don't dwell on how unpredictable they were. Operation Warp Speed got covid vaccines out within ~1 year. Initial predictions were more in the >= 5 years time range. Fast covid vaccines were very much a "white swan" event, but reporting around it wasn't "this is so unlikely to have worked out" etc.