"True psychedelic" is not a very descriptive term, and is open to multiple definitions. In the past, I preferred using that label for drugs whose primary mechanism of psychoactivity is agonism at the 5-HT2A receptor, but I now refer to those drugs as "classical psychedelics." It is undeniable that MDMA has psychedelic qualities (primarily due to its low activity at the 5-HT2A receptor), but I do not like to call it a psychedelic because I feel that labeling it as such obscures the huge psychopharmacological differences between it and the classical psychedelics. As a side remark, I fucking hate how the government and law enforcement describe it as a "psychedelic stimulant" as if its effects amounted to those of a mixture of the two drug classes. Things like DOB and AMT are psychedelic stimulants (well, if you want to get really technical, all psychedelics are stimulants), and MDMA isn't. I think "entactogen" really is a better term for most MD-class compounds (excluding MDA, which really does straddle the boundary and can best be described as a "psychedelic entactogen"). For the same reason, I do not really like the use of the plain "psychedelic" label for DXM, ketamine, or PCP, which I prefer to call dissociatives, or even better, "dissociative psychedelics." Now that I've gone on this long and somewhat pointless discussion of semantics, I'll contradict everything I previously said and state that actually, from a descriptive and etymological point of view, "psychedelic" is actually a good label for all of the drugs I mentioned above. However, "hallucinogen" certainly isn't because it excludes most MDXX compounds, but still can be used to describe the dissociatives. Thus, the problem is that we don't really have a word that can only be used to describe the 5-HT2A agonists (whereas we have "dissociative" and "entactogen" for the others), and so we get into these semantic arguments about what is truly a psychedelic.
Salvia definitely has psychedelic qualities, and perhaps it is of the dissociative variety (closer to nitrous than ketamine IMO). I am not sure whether it is a dissociative because I have never broken through on DMT, which is not regarded as dissociative, and thus do not have a standpoint for comparing dissociative and non-dissociative "breakthrough" experiences.