Perhaps, but only at very low doses. Dr. Greger explains. Note that the study suggests that too much rosemary might interfere with cognition.
I did find the results about aromatherapy interesting. I had always assumed that the idea was implausible. But Dr. Greger points to a study that shows that the volatile compounds used can actually be measured in the blood. This doesn’t mean that aromatherapy works, only that it’s plausible.