I've been in health IT for the last 15ish years so I know a lot about patient matching (wrote at least 4 patient matching MPIs in my time at different companies).. so maybe it's just my perspective..
However, that all being said, almost all processes like this are NOT automated, but instead handled by automated emails telling people to do operations. You're basically then subject to the lowest common denominator logic of people in IT that are in charge of disabling accounts- with no regard or care about who the person is.
Anyway to the person that got fired like this - just be happy you are out of the environment - it is not for you. There are signs in life.