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Downforce created by an angled foil does create drag, by definition... An airplane wing perfectly aligned with airflow doesn't create much drag, but it also doesn't create much lift. A plane has to tilt its wings to fly (contrary to what they taught is in school about the Bernoulli effect).
The question to ask is first of all, what does the splitter do? Does it create downforce, or does it reduce lift? Then you have to ask how it does that-- by channeling existing airflow, or by acting like a sloped wing? It obviously isn't a sloped wing, because it's attached to the vehicle and blocked off at the back by the grill.
It probably reduces lift by preventing airflow from being directed under the vehicle, so it could be reducing drag also.
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