This wording change came with the last patch but the functionality remained the same. If you go over the wowhead tooltip and look over the changelog you will see it:
http://legion.wowhead.com/spell=1965...ssing-of-tuure
Technically it's still a proc chance on a crit heal/flash heal which is 15% chance before and has no cd whatsoever but probably they will transition it to 100% chance on crit with an icd instead to make it somewhat more reliable given the tooltip change.