The release note for 2/14/2017 says it includes a "prospective" fix. The wording seems to suggests some uncertainty. Is it untested, or a difficult issue to reproduce?
You can fairly reliably reproduce it on a training dummy. Just use one of the 4 broken abilities while the dummy is missing health. Looks like it's only partially fixed. This one is still broken: YOUR U'lla's Resolution heals training dummy for a critical 2399347 hit points. While these don't seem to be healing it anymore: Devour Truespirit Venom Silent Talon
U'lla's Resolution is still not fixed. At least it still gives me a way to kill people's mercs on PQs, though unfortunately some pets go along for the death train too, as seen here: http://i.imgur.com/zskxQly.jpg