One flourfrankenfood tortilla has a day's worth of fiber enough resistant starch 4 to allow the FDA to label it as a day's worth of fiber.
A real flour tortilla has barely any. Resistant starch 4 is a starch that does not occur naturally and is created using a chemical process to develop bonds humans have difficulty digesting, which allows food manufacturers to label it as fiber.
There's some relatively weak research indicating it has similar benefits, but none on potential harms of using it as a daily fiber source. Totally a tangent, but went down this rabbit hole a couple weeks ago with my gf because she also found those tortillas. Seems like a bit of a 'too good to be true' scenario to me, but who knows.