If the idea is obvious enough to AI researchers (evolutionary approaches are not uncommon -- they have entire conferences dedicated to the sub-field)), then avoiding discussion by Bostrom et al. doesn't reduce information hazard, it just silences the voices of the x-risk savvy while evolutionary AI researchers march on, probably less aware of the risks of what they are doing than if the x-risk savvy keep discussing it.

So, to the extent this idea is obvious / independently discoverable by AI researchers, this approach should not be taken in this case.