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.
Trump-scandals kinda killed Hanlon's Razor [0] for me.
A miasma inseparably blurring the lines between malice and incompetence, lies and ignorance, culpability and insanity, condensing into a greasy alloy which is definitely some amount of evil yet not worth anybody's time to separate and assay.
[0] "Never attribute to malice that which is adequately explained by stupidity."
Musk may not know vote-counting computers better than anyone else, but he certainly has the influence and leverage that would greatly help with such a task.
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.