Yeah, that's why they're referring to the sample company Audentity.
And by from the synth, do you mean the loops and sounds from the actual sampler, or do you mean they created vocal chops using the plugin and uploaded those? Because if they're utilizing the plugin the way it's intended and creating musical vocal chops, there's nothing wrong with it - they created something unique with the idea.
If they're just pulling the sounds straight, without processing or alteration, that's a different issue.