Money is fungible. What you get somewhere (his own sources or taxpayer funded) is used elsewhere, including Spacex.
Can you dispute the five billion in subsidies? Can you say he received no subsidies at all?
No, no one can.
He is on the taxpayer teat for a good portion of his wealth. If he was so successful at paypal why did he need the $5 billion?
Can you say he received no subsidies at all?
No, no one can.
...
I can say he started SpaceX without subsidies. It was mostly done with his proceeds from the sale of PayPal.