The way I see it, this represents a Rogue learning a few 'wizardy' tricks. They're not really SLA (at least not in the same way Wizard/Cleric SLAs are), but they sidestep having to give the Rogue with that talent an actual spell progression, and to restrict them to the small amount of magical talent they've 'borrowed' from some poor fool's spellbook. They're Int-based because they're practiced and learned, rather than a manifestation of existing magical power.