In searching for the primary sources for the quotes in this article I found that "Extreme Metaphors" (ISBN 978-0-00-745485-3) seems to be the best collection of J. G. Ballard interviews.

Quite a few are collected here:

https://www.jgballard.ca/media/interviews.html

One of the interviews referenced in the OP can be found here:

https://www.jgballard.ca/media/1987_november_i-d_magazine.ht...