[ijustwannatosay]

Do they still delete stuff when the site removes access via robots.txt? Others can look at this example and later when they also need to do "history hacking" decide to get rid of this problem by removing themselves from the wayback machine. IMHO, if you are important enough to have a Wikipedia page, what you say publicly should be immutable.

[square_usual]

Wikipedia page is a low bar, to be honest, and you'll end up in some sticky territory with the right to be forgotten.

[dwardu]

If the site is hosted and funded using public funds not personal funds, then yes it should be immutable. Otherwise, he can do what he wants.

[pmachinery]

Not if he wants to cite it in an official capacity, as he did here.