The article explains that Presidents Nelson and Oaks were originally called to fill vacancies in the Quorum of the Twelve created by the deaths of Elders LeGrand Richards and Mark E. Petersen.
This is interesting because both Elder Richards and Elder Petersen made a point of teaching that the Hill Cumorah of Mormon 6:6 is in western New York.
Some people tell me that the Brethren have changed their minds about Cumorah, which is why the Mesoamerican/Two-Cumorahs theory (M2C) is so widely depicted in Church-related material, including the curriculum at BYU and CES.
I see zero indication of that.
It strikes me as highly unlikely that either President Nelson or President Oaks would repudiate the plain teachings of the men they replaced in the Quorum of the Twelve.
Here is an excerpt from Elder Petersen's General Conference address in 1978:
You can read or watch it here:
Here is an excerpt from Elder Richard's famous book.
LeGrand Richards: "It was at this time that Mormon deposited in the Hill Cumorah all the records that had been entrusted to him except a few plates that he gave to his son Moroni. (See Mormon 6.) About A.D. 420, Moroni placed these plates with those his father, Mormon, had already deposited in the hill. (See Moroni 10:1-2.)" A Marvelous Work and a Wonder, p. 73.