A very quick trip to PubMed revealed the following:

A dietary fiber-deprived gut microbiota degrades the colonic mucus barrier and enhances pathogen susceptibility

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5131798/

The lack of an exact list of the content of the feed, and the duration of the study, and the lack of attention to confounding variables....

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Teaser, I thought of the young man at Crohn's Carnivore who healed himself by doing what you are doing:

https://crohnscarnivore.blogspot.co...ml#comment-form

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Peter Dobromylskyj has posted about the differences between the fiber/BHB and the no-fiber plus butter/BHB.
A site search from Duck, Duck, Go brings up many of his posts. Search term: betahydroxybutyrate

Peter's blog, Hyperlipid, is http://high-fat-nutrition.blogspot.com.

He has also written several posts on fiber.