Dvorak hated that for decades wikipedia had the wrong birth year and refused to let him change it. He wrote at length about how wikipedia is the antithesis of the entire conception of a wiki. He was 80, born in 1946.
I found very quickly an NYT article from 1993 that listed his date of birth as "April 5, 1952". I don't know if that's the source for the Wikipedia article but that info has been around for a long time, it seems.
The odd part is that the announcement used the same erroneous date that Wikipedia used to have. Perhaps someone forgot to refresh their cache for a couple of years.