Read it with this context. Exceptions named (Jones 2023; Acemoglu and Lensman 2023); footnote 38 notes AI x-risk is sometimes listed in generic catastrophic-risk models (Martin and Pindyck 2015; Aschenbrenner 2020); next sentence: absence 'not primarily "by choice"' but for lack of a mechanism in existing growth models. The April 2026 revision drops this statement and says the economic valuation of x-risk mitigation 'has generated substantial recent analysis (Jones, 2024, 2025; Shulman and Thornley, 2025)'.
Why: Fresh-context audit (A2) judged that the quotation misleads when shown alone.