The author also uploaded that paper to Researchgate, where it's available for free: https://www.researchgate.net/publication/260275150_Interstellar_Travel_-_Th

The author also uploaded that paper to Researchgate, where it's available for free: https://www.researchgate.net/publication/260275150_Interstellar_Travel_-_The_Wait_Calculation_and_the_Incentive_Trap_of_Progress https://www.researchgate.net/publication/260275150_Interstel... (edit: I presume the downvotes are for linking to Researchgate? I know they're not held in high regard like Arxiv, they're more like a sleazy Linkedin for academics, but if there's valuable content there why not use it?)