On Flavoring/Reskinning: pg 12
These two paragraphs make it clear that as long as the mechanics do not change, players and GMs can "skin" their equipment and abilities however they like. Obviously, there should be some discussions at the table during Session 0 to make sure everyone is on the same page tone wise.
One thing it does not talk about, though, is how this reflavoring might affect the fiction and the things that are true in play. For example, superhero games often talk about this since powers that are otherwise the same might have different "special effects." I am a little surprised (and maybe it is somewhere else) that DH does not acknowledge the fiction impact of reflavoring. This is especially important for the GM, I think, because "with fear" is a fiction first result and GMs (especially new ones, and ones new to narrative games) might need some guidance on how "the rogue's magic taking the form of gadgets and inventions" can be used in narrative context.
I think the campaign frames cover this pretty extensively? See: motherboards paragraph on changing all magic to tech.
A shoutout here would’ve been good if missing tho.