Who said anybody changed their mind?? They wrote a short-term provision into Article II. Do you think that the provision of being a citizen at the time of the adoption of the Constitution is still in effect today??
Of course the clause is still in effect, it has not been altered or abolished via the only means available to alter or abolish it. There has been no Constitutional Amendment affecting that clause.
As to the existence of any individual to whom that clause may apply, there are no longer any who are known to exist. He or she would certainly have had to be born before the conclusion of the Revolutionary War and quite possibly before that war began, in order for that clause to have applicability.
Barring time travel becoming science fact rather than science fiction, or a US citizen having reached the truly astounding advanced age of 238 years, unheard of outside the Old Testament, they’re all long since turned to dust, in this world at least.
Naturalization Act of 1790:
"And the children of citizens of the United States that may be born beyond Sea, or out of the limits of the United States, shall be considered as natural born Citizens:"
US Constitution Article II Section I:
"No Person except a natural born Citizen, or a Citizen of the United States, at the time of the Adoption of this Constitution, shall be eligible to the Office of President; neither shall any Person be eligible to that Office who shall not have attained to the Age of thirty five Years, and been fourteen Years a Resident within the United States."
Naturalization Act of 1795:
No natural born citizen exemption for citizens anymore after 1795 since the time of the Adoption of the Constitution had expired. That language in the 1790 Act was not put in the 1795 Act or any subsequent ones.