that is true but the feat says in the first sentence that you are healed by positive energy to heal the living and the spells do heal the living. I have also found a spell called life channel that gives an example using cure light as a source of channeled positive energy.
LIFE CHANNEL
School transmutation; Level cleric 2
Casting Time 1 standard action
Component V, S
Range touch
Target one touched creature with negative energy affinity
Duration 1 minute/level
Saving Throw Fortitude negates (harmless); Spell Resistance
yes (harmless)
When cast on a creature with negative energy affinity, the
target is able to convert channeled positive energy into
temporary hit points. When subject to an effect that heals
hit points only to living creatures (such as cure light wounds
or channel positive energy), the target gains a number of
temporary hit points equal to half the number of hit points
that the positive energy would normally heal. These temporary
hit points go away at the end of this spell’s duration.