OK....lets assume we take that definition where two citizen natural born parents are required. If so....then trump does not qualify for president either.
The Vattel definition used by the Framers: a natural born citizen is one who is born in the country (jus solis), to parents (plural) who are citizens (jus sanguinis), at the time of the birth.
Yes he does. His father was born in the the US and is mother was naturalized about 5 years before he was born.

Mary Anne Trump (MacLeod)
Trump's mother, Mary Anne MacLeod was born in Stornoway, Scotland, giving her British citizenship at her birth in 1912. In 1930, aged 18, Mary visited the United States and met Fred Trump a U.S citizen. They were married in 1936. Donald John Trump Sr. was born on June 14, 1946, in the borough of Queens in New York City. He is the fourth of five children to Mary Anne MacLeod; 1912--2000), a homemaker and philanthropist and Fred Trump (1905--1999), who worked as a real estate developer. The following 1942 receipt of Naturalization to U.S. Citizenship for Mary Anne is shown here:

Donald John Trump Sr. has provided sufficient documentation attesting to his place of birth, and upon research of his parents it is determined that they were both American citizens at the time of his birth. There is no doubt that at his birth his natural allegiance for the United States of America was and is as a natural born citizen.
Where does THAT line of inquiry come from? I mean, it is theoretically possible to define the qualifications on a multi-generational basis, and of course it is possible to make up all manner of hypothetical. What I'm wondering is what would prompt a person to offer the hypothetical you put out? Nothing in the constitution or the surrounding historical documents suggests such a thing.
The hypothetical is better viewed as coming from a crank, and not deserving of serious debate. Are there cranks and crackpots out there? You betcha. Some of them post of FR.