It appears to be just a case study of two people, not an actual research study. I note that in the case study they say the two men regularly ate venison from a CWD-infected deer population, yet we have no proof that the deer they were actually eating had CWD. Given they're geographically close friends who seemingly spent a fair bit of time around each other, I imagine they were exposed to many similar environmental factors apart from just possible CWD deer meat.
I think it was irresponsible for them to say "This study presents a cluster of Creutzfeldt-Jakob disease (CJD) cases after exposure to chronic wasting disease (CWD)-infected deer" in the study's abstract. The researchers provide no proof (or even claim at all in the results section) that they were actually exposed to CWD infected deer. That's an assumption the "researchers" make based on the CWD prevalence in the deer population.
Unless I'm missing some different article where they present real evidence, this just seems like an inexperienced medical student who found a unique situation he could write a case study on to boost his status to get residency or other positions. The lead author is a medical student at UT Health and the person who signed off on this (likely Sarah Horn, the last author) should have made him edit it to be less declarative. The take-home of the paper is "See this unlikely thing that happened? Weird, huh?".