Only reference I could find mention Val’kyr doesn’t call them Spirit Healers. In fact Spirit healers are not even mentioned in the 3 volumes of Chronicle.
Not all Val’kyr continued to follow Helya after Odyn’s defeat. Some of these spectral beings disappeared into the Shadowlands. The few who still retained a glimmer of nobility in their souls dedicated themselves to watching over the physical world. From within the Shadowlands, these Val’kyr would at times guide the dead back to the land of the living.
Chronicle Volume 1 Page 57
Noble Souls dedicating themselves to watching over the living realms sounds like what the Kyrian of Bastion does. These Val’kyr when disappearing into the Shadowlands could have gone to bastion and joined up.
But again the term Spirit Healers are not mentioned in Chronicles even though that what they’ve been called since Vanilla and before Val’kyr were created.