Bunk.
From the "Findings In Brief" section
Despite the facts that:
• BasicMed pilots are older on average than airmen maintaining third-class certification and the
pre-implementation third-class population.
• BasicMed allowed more than 18,000 airmen to conduct operations in aircraft that qualify for
BasicMed. These airmen did not hold a medical certificate in the six months prior to qualifying for
BasicMed and would not have been permitted to operate any aircraft other than balloons, gliders
or light sport aircraft without a medical certificate.
• Over half of BasicMed airmen had their last medical certificate examination between three and
five years prior to registering for BasicMed, and 67 percent of BasicMed airmen had expired
medical certificates at the time of registering for BasicMed.
• BasicMed airmen are much more likely to have required a Special Issuance. Referencing the
meaning and purpose of a Special Issuance, this reflects a potentially elevated risk of
incapacitation among the BasicMed population in the context of reduced FAA oversight...
Nevertheless,
• No difference was found in the risk of BasicMed and third-class airmen having an aviation
accident from the start of BasicMed in 2017 through the end of 2019.
• No difference was found between accident-involved BasicMed and third-class airmen in the
phase of flight in which their accident occurred.
• No difference was found between accident-involved BasicMed and third-class airmen in fatal
versus non-fatal outcomes.
• No difference was found between fatally injured BasicMed and third-class airmen in autopsy
findings.
We also read that
• When restricted to medically related death, BasicMed airmen had an age- and Special-Issuance-
adjusted risk of mortality over the study period 53 percent higher than airmen who maintained
third-class certification.
• BasicMed airmen had an age- and Special-Issuance-adjusted risk of death from stroke or
myocardial infarction three times the risk for airmen who maintained third-class certification.
These conditions pose an increased risk of sudden incapacitation.
• BasicMed airmen had twice the age- and Special-Issuance-adjusted risk of death from cancer
than airmen who maintained third-class certification.
That would seem to indicate that things like stroke or myocardial infarction or statistically insignificant in the context of aviation accidents, since they're more likely for BM pilots yet there was no difference in risk of accidents between BM and class 3.