(New link for article - https://www.verywellfamily.com/social-and-emotional-problems-affecting-gifted-children-1449336)Thanks for sharing that article, it deserves to be widely read. The citation
Redding, R. (1989). Underachievement in the verbally gifted: Implications for pedagogy. Psychology in the Schools, 26(3), 275-291
indicates 1989; Having that information available for 25 years, some may say that gifted pupils ought to be better
understood and therefore better
served by educational systems.