Having written a book and created a YouTube channel isn't any sort of evidence for the validity of much more than the creators ability to create a book and YouTube channel.
The ability to make a book in service of own's argument is evidence of a great deal many things: at the very least, dedication and conviction to one's argument.
The space race was about international posturing and displays of technological capability as a deterrent to engaging in nuclear war.
This is 100% valid, and yet it resulted in us putting a man on the moon, so you haven't really detracted from the argument.