I found this claim to be slightly exaggerated and misleading. From the original article, they stated 7 potential positive benefits of coffee. These potential benefits weren't supported by scientific fact and were nit-picking from the larger topic at hand. Further, the effects of coffee don't go for just caffeine as a whole and I think it is important to highlight that, they also stop being positive after a certain intake. The article from Healthline states:
"Also, keep in mind that some of the evidence is not strong. Many of the above studies were observational in nature. Such studies can only show association, but cannot prove that coffee caused the benefits."
To support/give meaning to this article, I found 2 others based in scientific research.
An article from NPR cites sources from Harvard health, and references studies that showed an increase in longevity of life in coffee drinkers. although more specifically, this applied mostly to 1-3 cups per day, and really didn't have much to do with the caffeine itself but rather the coffee bean. The article states" It's not likely to be the caffeine. While studies don't prove that coffee extends life, several studies have suggested a longevity boost among drinkers of decaf as well as regular coffee," (NPR). The article is from 2018-fairly recent and has a credible author with many cited sources to specific studies linked throughout the article. Although, this study is also observational, and it seems more research is still needed.
An article from Mayo Clinic discusses the negative effects of caffeine and further reinforces the point from NPR and Harvard Medical, that 4 cups of coffee seems to be a healthy limit and can have potential benefits.
The further clarification from this claim needed is scientific data, ideally more than just observational studies will be conducted in the future, and the specific nature of the claim. That over 4 cups of coffee is too much and doesn't increase your health but rather the opposite, and also that it isn't the caffeine with the positive effects.
https://www.npr.org/sections/thesalt/2018/07/02/625128383/coffee-drinkers-are-more-likely-to-live-longer-decaf-may-do-the-trick-too
https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/caffeine/art-20045678