This is a very interesting theory, but also low-quality evidence. It merits further study, but hard to say that it merits any change in behavior just yet.
As far as I can tell, the "340 000" person study was finally published in 2020[1]. The study was an observational analysis of 342,000 dialysis patients. There was no attempt to measure personal exposure to UV (FTA: "it was not feasible to determine personal exposures to UV radiation and temperature"). Rather, these exposures were approximated by dialysis center zip code.
I can understand why David Fisher would say that he doesn't question the data, but doesn't agree with the implications.
As far as I can tell, the "340 000" person study was finally published in 2020[1]. The study was an observational analysis of 342,000 dialysis patients. There was no attempt to measure personal exposure to UV (FTA: "it was not feasible to determine personal exposures to UV radiation and temperature"). Rather, these exposures were approximated by dialysis center zip code.
I can understand why David Fisher would say that he doesn't question the data, but doesn't agree with the implications.
1 = https://www.ahajournals.org/doi/full/10.1161/JAHA.119.013837