vis Jim, it all appears pretty reasonable, he probably would have met the threshold in some guidelines for some more invasive cardiac screening (CCT/Angio) years before his stroke if you take him as a Class 1 who does single pilot air show work and some instructing. Retrospectively his condition may have been present for a number of years prior and wasn't/couldn't be detected. If all of the required/indicated investigations were negative and then guidelines stratified him into lower risk cohorts of diabetic, hypertensive elderly men he may not be (in the narrative he obviously isn't') above the level where his Class 1 is revoked. What's the exact issue? There is a conflict though at around that age, where as it was raised, it doesn't really matter how many negative tests you have, it's getting close to closing time percentage wise- this conflict I understand is based on age discrimination issues, you can't blanketly revoke licences on that basis and there aren't sensitive enough tests to demonstrate prospectively what pathology Jim has.
Post his event they made him fly privately with QFI only as a mitigation as out of 100 Jims much more than 1% will suffer an incident, not going to be a fun day for the QFI though as Jim's 10 through 38 keel over and not appropriate to have it occur in a commercial context i.e. multicrew as a mitigation (although it could be feasible in a younger, less comorbid individual as their culminative hazard would be less but that's a different story).