Barron Trump is not an Art. II, §1, Cl. 5. natural-born Citizen. He is a 14A §1 Birthright Citizen. Natural-born Citizens are citizens by natural right, while 14A §1 Birthright Citizens are citizens by the plenary power of the state. In other words, Barron is a ‘naturalized’ U.S. Citizen at birth. The only natural-born offspring of Trump is Tiffany Trump Boulos.
Barron Trump was born in the United States to parents legally within and under the authority of the United States. That makes him a Natural Born Citizen of the United States. Period. This is what the term was known and understood to mean at the time the Framers wrote it into the Constitution, and this has been adjudicated multiple times.