no, having read it again what i was confused about was this:
"(this is slightly power-gamey but if you happen to get 2 knowledge skills up to 10, and then take skill focus in a knowledge skill, you only have to take 3 levels of rogue to get the exclusive skill up to 7 ranks by taking a level in loremaster prestige class, this lets you get to 17th level spellcasint power or 9th level spells)"
i thought the skill focus was about something other than getting to the loremaster...
so there we go.