In the last 8 years there have been over 50 court cases, state A/G challenges, appellate decisions and more that refined and defined what Natural Born Citizen means. It means the same as a Natural Citizen. Even SCOTUS accepts this as they have not ruled otherwise.
Was that the Framers original intent? Who knows? They weren’t sure themselves.
But one thing is clear - Cruz is a Natural Citizen. And as such; he is eligible.
What’s a “Natural Citizen”?