No, not toxic traits. Literal, absolute, augmentations to survivability.

I agree that THE WORD “environment” applies to them.

You need to understand that they ARE NOT “the environment” as applied to darwinism/survival of the fittest. They are augmented and artificial, and that removes humans from natural evolution, which is the entire point being made. Humans changing their environment so much as to have wholly separate spaces with wholly separate conditions than nature removes humans from the natural order of events of the planet’s biome. Yes species still change under artificial conditions. The point is humans are more subject to artificial conditions than natural. At least until natural conditions get bad enough.