So, I actually took the time to read the post this time and, firstly this was based on the media tour build, anything and everything is disregarded as not everything is the same in the final build.
Secondly, in the post under paladin block there is only mention of a minimum damage reduction of 10% in SB, while in regards maximum, only a 10% drop from the 29% from SB at 19% damage reduction in the media tour build which is expected from scaling a stat. The final thought mention that "the new formula seems to give 10% less mitigation-- at least with gear provided." So it's not gospel and it's a small pool of gear to test with just the media build.
This theory craft was also done before patch notes stated the reduction in parry and blocking which may give rise to some change in the formula. You speak about misinformation yet you state incorrect information regarding blocking from the source you linked.