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Given that Trump actually won Pennsylvania by 2%, he's casually bragging about something that isn't actually true - at least the "in a landslide" part isn't true. But then, Musk knowing vote counting computers better than anyone isn't true either (though Musk may be arrogant enough to think it is). So I think this is just Trump throwing out fact-free hot air that he thinks makes him look good.
He's the kind of guy that robs a bank and comes to the office the next day driving a Ferrari.