The answer to the post title question is NO, it doesn't. Eilers (MIT), Rix (MPIA), and I discussed Eilers's project on this subject today. If you use the APOGEE data naively, you can conclude that the bar has different abundances. But your conclusion is wrong, because the abundances have surface-gravity-related systematic issues, and the Galactic center is only visible in the most luminous (lowest surface-gravity) stars. So we have corrected that and have a paper to write. Even after correcting for this systematic, there are still interesting systematics, and we don't know what they are, yet.
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