Not a gamer, just thought i'd chime in my 2 cents. Thomas is a Human, he has a soul, he eats, drinks, sleeps, procreates et c. just like every other human (besides that whole, consuming life energy to keep his demon fed) so it only makes sense that his magic messes with technology just like every other person that uses magic. The other two courts do not have souls, and they're drastically different than people, therefore i think it is safe to assume they do not mess with tech like a Wizard, or a Wampire using magic.
GK