Tom Duff at the end is referring to a very nuanced kind of response of Knuth to Dijkstra from 1974, like so:
> The best reference on programming in a disciplined way using goto is still D. E. Knuth's paper Structured Programming with go to Statements, ACM Computing Surveys, Vol. 6, No. 4, December 1974, pp. 261-302. I think that everything I have to say about goto is in his paper.