Why wouldn't they? Silksworn spells are arcane, not psychic, so they use the rules for arcane spells not for psychic spells. Psychic spellcasters not needing to use (non-costly) material components is a property of the rules for psychic magic, not a property of the classes which are by default psychic spellcasters.
A reliquarian occultist will also need to use a divine focus (likely an implement) to cast some spells for which a regular occultist would get to skip the M/DF component (e.g. Deeper Darkness).
Since psychic spellcasters still use material components where these are significant (1+ gp), calling out the change would be hard to phrase without leaving a possible ambiguity. And if there's anything I've learned from reading these forums it's that any hint of a possible ambiguity gets pounced on and seized as holy writ by someone.
Technically they didn't need to mention the verbal and somatic swap, it's just a reminder.
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I only mentioned the components to make it entirely clear, and because the existing example at the time (the reliquarian) did so. Wordcount can be a pretty major factor in these as well, but I'll admit that I didn't think to specify about material components. It was my fourth assignment, and I wasn't yet completely aware of the rigor with which the forum dissects text.
In any case, they need material components just as much as any other arcane spellcaster. The verbal/somatic components text is just a reminder, not an exhaustive list.
Hopefully this helps. ^_^