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If you checked the metadata on that specific edited picture, you're only seeing metadata left by whatever program anon used to edit that picture. "Adobe XMP Core 5.6-c067 79.157747, 2015/03/30-23:40:42" refers to program version and date when said program was released.
Make sure you always check the metadata of the original picture. I have tried dozens of online metadata viewers and couple of programs designed to dig metadata and no metadata whatsoever can be found from Q's original picture.