If you’re genuinely interested in what “artificial superintelligence” (ASI) means, you can just look it up. Zuckerberg didn’t invent the term - it’s been around for decades, popularized lately by Nick Bostrom’s book Superintelligence.
The usual framing goes like this: Artificial General Intelligence (AGI) is an AI system with human-level intelligence. Push it beyond human level and you’re talking about Artificial Superintelligence - an AI with cognitive abilities that surpass our own. Nothing mysterious about it.