Thanks for the link. I'm interested in checking out the underlying sources, and they claim to already have taken "research performed by" vs "research funded by" into account. I'm aware of many private funding sources in academia, but the grants are typically small and few (though massive and almost eternal grants from HHMI and the like may make up for much of that).
I wasn't aware that so much research was funded by the private sector and I'll honestly still be a bit suspicious of the numbers until I really look at it. I wonder what is necessary to claim that an amount "funded research" and what the likely cases of misrepresenting this may be (eg. "market research").