Do remember that the sqf guidance material comes with no guarantee of veracity. And has justified this tag on various occasions.
Not suggesting that sqf deliberately mislead, more likely they lack capable proof-readers or perhaps choose to ignore minor errors until they become major. Glossaries are a good source of strange definitions if you have a little spare browsing time, sqf definitely contains some of the weirdest but brc is not without blemish and as for the ifs text.......
On the pro-side, If called on, the sqf technical backup can clearly produce excellent monographs, eg their allergen program document. it's a pity there are not more of the same. And they are free !
My guidance comment may also apply to the sqf faq but the latter has, afaik, not yet been specifically found wanting. The info. relating to compressed air is well in the running though. 
iso-fssc22000 and also brc(from memory) do not require prerequisite validations so perhaps sqf have finally seen the light.
looking at Prerequisites, why validate a pre-defined, officially accepted, haccp support program ? But this conclusion assumes Codex validation, not the Sqf variety.
Rgds / Charles.C
PS - I couldn't quite work out from your post whether you were now agreeing that validations of prerequisites not mandatory, or the opposite ? 