Sorry, that was a little vague, there are "standards" but they don't seem to be very through when it comes to reptiles.
For humans, many domestic animals and particularly for very well studied animals like rats and mice there are standards of what amounts of what nutrients are needed for growth and health. This is what I would consider a truly accurate measure of "completeness".
Reptiles aren't as well studied so there isn't such a defined set of standards to qualify against.
It's for that reason, such a product to claim be "nutritionally complete" or "complete diet" is potentially misleading to me. In addition the rules are quirky for pet food, and there are ways to make inaccurate claims on the packaging.
That said, achieving the same rough content (proteins, fat, fiber etc) as what's in a healthy "diet" of plants and bugs should be possible and maybe these products offer that. It's likely they are superior to a bad diet if unhealthy bugs and poor veggie choices. I have nothing against packaged foods, I just don't trust them yet. It is much more likely that something important becomes deficient if we only rely on a limited range of food sources.