It's new but not as new as the article tries to make it sound. Has been known for a while and is in use. Further, it's not going to "revolutinize" anything, it's another incremental med that has shown improvement in outcomes. Just like beta blockers and aldactone, it buys you some small clinical benefit.
Anecdotally, the beta blocker propranolol crashed my testosterone levels, and slowed my hair and fingernail growth. I believe the latter are due to increased rT3 conversion, effectively medically-induced hypothyroidism.
The term "heart failure" and the word "failure" strike me as incongruous. One would expect that someone who has experienced heart failure for more than a few minutes is by definition dead.
