Right, but I would say "a particular kind of placebo effect ____" to distinguish between the two meanings:

a) "expecting to heal makes you more likely to heal due to psychosomatic effects"
b) "the general stuff they do to you in conducting a trial (the regimentation, the social contact, the clinical environment) is likely to cause some healing regardless of the specific treatment being tested"

To the extent that Morendil is claiming we have to be careful to distinguish these meanings, which both go under the name "placebo effect", I agree. Beyond that, I don't see what kind of reification is going on; you don't have to reject reductionism or naturalism to believe there are psychosomatic effects of the kind in a), especially in the realm of sensations of pain and well-being.