NBC have a good article about the study
www.nbcnews.com/health/health-news/study-finds-health-risks-transgender-women-hormone-therapy-n890031
Interestingly the paper also looks as if it compares the effect on HRT on women to the effect of cross sex hormones on men, finding that risks decrease with time for women on HRT but rise for cross-sex hormones on men. This is particularly concerning if the trend holds true over longer time periods given that younger and younger people are now taking cross sex hormones which they are then expected to stay on for life.
“This is a great study and I’m not surprised by its conclusions,” he* told NBC News. “But my concern is that doctors who are inclined to deny hormone therapy will use this study as a reason to do so.”
*Dr. Richard Greene, an associate professor of medicine and director of health disparities education at the New York University School of Medicine, is a primary care doctor who treats many transgender patients
I'm particularly interested that a 80-90% increased risk (from a relatively low baseline granted) is thought to be not a reason to think about stopping prescription for this group of patients, but any increased risk is considered a contraindication for people like my daughter who are told they can't go on the pill despite months of acute pain (because of migraines with aura) even when there is nothing else on offer by way of treatment.