All of that said, it seems the researchers must have excluded the Tesla Model 3 from the options or used some odd methodology or timeframes, since it seems impossible the Model 3 wouldn’t garner the most searches in some states, if not most of them.
You included just plain "tesla" in that comparison. That will include searches for the company itself, or solar panels, etc. "volt" and "bolt" and "leaf" are also too generic for search terms. You need to include make and model.