[dmtroyer]

they spend almost a whole page addressing this.

... Alzheimer’s disease symptoms typically develop after patients’ working years, with only 5-10% of cases occurring in people younger than 65 years (early onset).11 14 While subtle symptoms could develop earlier, they would still most likely be after a person had worked long enough to deem the occupation to be a so-called usual occupation ...

[dundarious]

Yes I saw someone say as much in other comments. My suspicion that transfers were not accounted for because the employment was a snapshot in time between 2 years was definitely wrong.

"What the funeral director deemed/was instructed to record as 'career'" is still somewhat limited, but is plausibly good.