His older kids have Czech citizenship from the mom so unless you think dual citizens can be natural born citizens, they aren’t. If he had married a Russian I don’t think it would be complicated at all to understand why the person shouldn’t be president. That was pretty much the point of John Jay’s qualifier.
I did not say that, today his older children would be NBC. What I said was, had those children been born between the years of 1790-1950, US law would have considered those children to be NBC because upon marriage to Donald, his wife would have automatically become a US citizen.