I would say, though, that if you are looking to draw out the implications of her though on trangender issues, you don't want to look at just what she said about them explicitly. You'd need to look also about what she said about women, and see if, when you get down to brass tacks, it would also apply to people who "identify" as women.
About 10 years ago, I read two of her books, 'Intercourse' and 'Right-Wing Women'. Intercourse has a sort of mesmerising, hallucinatory quality, so I might not be recalling the book accurately, but I do remember being puzzled at how little attention it paid to pregnancy. Much of the book, IIRC, is straight-up literary analysis of the sexual politics of male writers like Tolstoy, Flaubert and Norman Mailer.
It's mostly concerned with the psychological effects of being penetrated, and the social effects of being a person who is defined as penetrable, with virtually no attention paid to the physiological effects of (vaginal) intercourse, which of course means pregnancy and birth (which for most of history carried a high risk of death) and child-rearing. It seems fairly obvious to me that those effects have had a far greater impact on women's freedom and equality than the act of penetration itself, but Dworkin seemed curiously unconcerned with them.
If Dworkin were alive today, it wouldn't surprise me if she (like MacKinnon) took the position that the two basic categories of human beings are 'penetrating' and 'penetrable', with the corresponding assumption that feminine-presenting men belong in the 'penetrable' category, and are therefore basically akin to women.