In their rejection, they said they want stories that are indistinguishable from the other content in the magazine.
Not distinguishable, especially:
Impossible to differentiate or tell apart: indistinguishable twins; markingsDifficult to understand or make out; vague: indistinguishable speech.
that make a moth indistinguishable from its background.
Impossible to discern; imperceptible: a sound that was indistinguishable to the human ear.
In art, idistinguishable indicates something that is merely decorative. Motel room paintings. Elevator music.
Since when is indistinguishable a desirable trait for fiction? Is one of the most prestigious markets for short fiction actually looking for stories that blend in with the background?
I'm at a Losfer Words (Big 'Orra).