I understand and agree with your assertion, that the 1795 law dealt only with immigration, but it did state that the 1790 law was repealed and that included the definition of the NBC. However, the words of the 1790 law state clearly what the writers of the Constitution meant as NBC, and that included foreign born US citizens.
When people talk of natural law they could just as well substitute the phrase, “common sense”, meaning it is common, sensible, and used everywhere. Well, at the time, British law had for years assumed any citizen giving birth would naturally give birth to another citizen.
Either way, NBC is as the 1790 law says, any citizen mother giving birth in a foreign land with a resident US father gives birth to a US citizen.
The law of 1795 actually clarified what the Founders would accept for born citizenship:
one who by descent was of at least one American parent, and no one who had fought for the British against the US no matter where they were born.