Can a valet familiar still deliver harmful touch spells?
The archetype says it "modifies" the deliver touch spells ability, but it's not really clear if it is modifying it by limiting it to harmless touch spells, or if it is modifying it by expanding on the existing options and allowing the familiar to move before and after delivering a harmless touch spell in addition to still being able to deliver a conventional harmful spell.
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It doesn't remove the ability to deliver harmful touch spells, you just can't spring attack with them.