The Short Version
The claimed mediation chain from FoMO through post-purchase dissonance to order cancellation intention is not supported as a tested model by any cited peer-reviewed study. While academic research does link FoMO to impulsive buying and impulsive buying to post-purchase cognitive dissonance, no source in the evidence base measures or tests "order cancellation intention" as an outcome. The final link relies on a practitioner blog equating returns with cancellation—a different construct. The claim presents a plausible but unverified synthesis as an established finding.