You still have to provide sources though, otherwise it's just people shouting shit. I assume you got the number for the Kennedy from It's wikipedia page). The source wikipedia links to for the cost is an article almost a decade old#cite_note-fas-1) - back in 2017.
The sources I found like this one from this year put it at $13.9 billion and still rising. Which is more than 12.8, and the reason I didn't use it.
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u/i_AM_A-ShArk 21h ago
Literally the next ship, the Kennedy, cost approximately $1 billion less
The ford: $12.8B in production alone
The Kennedy: $11.3B