I believe the study used caffeine pills, so maybe there’s something special about coffee itself. Or, another possibility is that you feel like your symptoms are improved, but they aren’t actually. Or the study simply got it wrong for some reason.

Actually, just went back and reviewed the video talking about the study (https://youtu.be/-SLUyGlrfI0) and I misremembered. It shows some evidence that caffeine can help adults, though not children. And generally there isn’t enough research to say definitely that it does help adults.