Above are the specific claims that were called "BS". One has to do with enabling me to use the www without interruption if DNS stops working.^1 The other has to do with "experts" going into panic mode.^2
Neither claim relates to something being "meaningfully faster."
1. Because I use stored DNS data.
2. Because none of them advise anyone to store DNS data, let alone use it. They opt to promote and support a system that relies on DNS to work 100% of the time.