I assume you are referring to the Wong Kim Ark decision? They didn't declare him a "natural born citizen." They conspicuously left out that verbiage.
They declared him a "citizen" and cited the 14th amendment, which is itself a naturalization act.
Natural born citizens have no need of the 14th amendment.
Similarly, children born to American mothers outside the country were always considered natural born citizens.
No, they were "considered as". If you look at the early acts granting citizenship to people born outside the country, you will notice they never say "is" a "natural born citizen." They say things like "deemed", or "considered as". They never use language that declares them to be a "natural citizen" with certainty.
I’ll need to see some decision by the SCOTUS saying they are not eligible, that they are not natural born citizens before I buy into it. The 14th amendment naturalized everybody born on the territory.