But the original study you were talking about was a meta-analysis of epi studies, and many of them show an association, usually not industry-funded. This seems like a non-sequitur to me
I've written several articles about confounding/coffee, and actually alluded to it in this thread. I literally have no idea whatsoever what you are talking about 
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Here's one I wrote in 2017 on this exact topichttps://medium.com/@gidmk/drinking-coffee-still-wont-save-your-life-9e4d45ba7087 …
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Oh that's pretty simple - it's a strong observed association, but it's unlikely that we'd be able to entirely remove residual confounding so a number of studies still see the connection despite controls
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