I posted that to demonstrate how easily her credentials can be located. Moreover, Ranae worked as a field biologist prior to her completing her studies and obtaining a degree. Whether she had the degree for one year or ten years, she came onboard the show as a degreed scientist with years of field experience.
We don't know what evidence and/or experience(s) led Renae to her conclusion. Just because you find her statement distasteful doesn't mean you get to invent a motivation for it.
ETA- The folks who can't reconcile the existence of physical evidence with Renae's "spirit creature theory" and use that to show she is being illogical need to re-read her actual statement in the first post here: