It sounds to me that they explicitly stated that they are making no comments on health benefits, but only on taste/aroma.
Getting someone to agree to tell you what has been scientifically "proven" may be difficult. Many would argue that such a thing doesn't exist. What CAN be done is look at data gathered and draw a conclusion on what that data shows.
Medical research, specifically, though, is often all over the place and typically a health institute(WHO, NIH, etc) won't make a recommendation on something until the data overwhelming points to a positive/negative imapct from something.
My best advice would be to get on PubMed and see what you can find on those site. Yes, it's technical. You MIGHT have some more luck if you find articles in the first place and ask someone to help you understand/interpret them. You should know, though, that in general access to scientific/academic search engines is often very expensive(PubMed is the exception) and full text articles(that are not public access) are equally as expensive.
Many of us on here have access to such things through our employers/affiliated institutions. With that said, using that information for things outside the scope of our employment is often strictly forbidden both by the institutions and the publishers themselves. That can cause someone agreeing to do it to both lose their job, and their institution to lose access or have to pay a hefty fine to the publisher. So, that's not a risk most on here qualified to do it is willing to take. Someone who CAN do it without running afoul of the user agreements is likely going to want a whole lot more than $100-you're talking likely a couple of days of time finding articles, reading them, and then putting together the results. That's also not counting if the person doing it is on a per-article and/or per-search access plan, where that $100 could easily evaporate in a half hour of searching.