Mid-Michigan's Bigger Dealer With Better Deals
Many black hat theories are generated by people who are relatively new to SEO. They are easily misled by the appeal of tricks which, as John Muller has pointed out, do not confer any advantage.
Because of the way 301 redirects work, the redirected domain simply does not exist and all links pointing to it are reported directly to the main site. The whole extra step of registering a domain name is absolutely pointless for ranking purposes.
The redirect number is a lesson in the value of understanding how search engines actually work. The 301 redirect number is not SEO, it is a useless superstitious activity like picking a penny for luck.
But there is an advantage to the 301 Redirect Number.