Are the Survey rankings for the National Research Council really more objective than the Regression rankings?
No, both rankings are basically nonsense.  Even if you agree with the NRC's choice of a single "quality" model across all intellectual disciplines, the rankings are based on horrendously incomplete and incorrect data.  This is especially true in computer science.

Also, the claim in the blog post is an obvious joke.  The S-rankings are "better" because  writer's home department's S-ranking was better than its R-ranking.