Basis for the Estimate

Academic Performance: Philosophy majors consistently rank among the highest for IQ and standardized test scores, with averages estimated between 126 and 130. Completing a graduate-level degree in complex fields like logic and epistemology often implies a cognitive profile in the top 2% of the population.

Sudoku Puzzle Setting: Dyer is highly regarded in the puzzle-setting community for creating extremely difficult puzzles. Solvers have described his work as requiring "brilliant" and "genius" levels of logic, which typically necessitates high fluid intelligence and spatial reasoning—key components of IQ tests.

Public Perception and Debate: While critics often characterize his style as "sophistry" or "mental gymnastics," even detractors acknowledge he is "sharp" and "above average". His ability to navigate dense theological and philosophical texts and engage in hours-long, unscripted debates suggests a high degree of verbal intelligence and working memory.

(http://www.autoadmit.com/thread.php?thread_id=5854882&forum_id=2most#49802659)