There is little you can surmise from the lack of a GreenScreen List Translator listing other than that the substance lacks a GreenScreen full assessment. It is possible  that the substance is highly hazardous for one or more health endpoints but has not yet hit the radar for the authoritative bodies. It may be that it has been well studied and is likely safe. Many authoritative bodies only study substances for which they have an indication of potential harm. There are few attempts to affirmatively identify low-hazard substances.