I would rule out the DW as being the culprit. Clean the filter at the bottom - most likely a Youtube video out there for your make/model. Then run a hot cycle with one cup of vinegar (leave it in the cup on top rack), follow with a short cycle with 1/2 cup of backing soda sprinkled on bottom. If still smelly - I think the suggestion of the plumber doing a poor job may be the issue. Good luck!
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