I was aware of that. I looked it up the first time I found out about Deutsch and all I remember finding is this interview (I also did a search just now and couldn’t find anything better). I was not discouraged by DD’s attitude, because
- The only potentially decisive criticism of string theory he gives in the interview seems to be that it is “not motivated by trying to solve a problem within theoretical physics,” but that’s simply false.
- He said “superstring theory is a worthwhile thing to explore but unlikely to work,” which is almost a quasi-endorsement.