It is, but it's extremely limited (especially the part where it says "The creature can't regain hit points from this feat again until it finishes a short or long rest."). In and of itself, it's not enough to allow a non-magical campaign - not to mention it costs a Feat (as opposed to being a Class Ability), requires that Feats be used in the first place (an optional part of the game), and having multiple characters with the skill (as would likely be necessary for a non-magical campaign) doesn't garner any additional healing ability because of the aforementioned restriction.
It's equivalent to limiting a campaign to only allowing the 1st level Cure Wounds spell - no Prayer of Healing, Mass Healing Word, Mass Cure Wounds, Heal, Mass Heal, or Power Word Heal - regardless of campaign level - and only allowing it to be used once per short or long rest per character.