Those poor women. I'm glad they survived, but not being able to take HRT anymore has to be devastating.
This is the reason I tell people often about my story, because even on a very very low dose of estrogen only (no actual amounts, but it's within the range prescribed without monitoring to cis women), I ended up with liver damage sufficient that I had to take months off of estrogen and be retested repeatedly including an ultrasound. My endo and GP are both quite sure it was the E that did it, and I'm lucky as heck that I had a routine liver function test done after three months in the beginning.
(Best guess, as I recall the explanation, is that it was a transient liver infection, which can be asymptomatic. I had no noticeable issues going into HRT, but add one more thing to the load on the liver and it was clearly too much. I STILL had no symptoms when the first [and 2nd opinion] test came back with scary results, and the endo says without testing, my first clue might've been liver failure.)