This is a pretty cool advice. Plagiarism is generally a bad idea, all across the spectrums. At the very least you should reference the source you got the article from. Also, additionally, to an article editor, you can also use an article spinner. It still produces unique content. It's just good courtesy to reference all the sources you use if it's not an original article. It is Much better than copying someone else's work, this is frowned upon not only on steemit in the world of authorship in general