I am not an expert on CEFs and I am definitely not recommending these particular funds but I do think CEFs can be reasonable investments. I own a few now and have owned ones in the past and done well with them. Not a big percent of my assets, but made me a few dollars.
I think this particular article is incomplete and poorly done, however, and I would disregard anything it contains for that reason. There is no mention that several of his featured funds include ROC in their high yield. Also many CEFs, most I believe, use leverage to boost results. Whether you think that is a good thing or not, it is definitely an important feature of these investments and one the author never even mentions. Another key feature that attracts people to CEFs is that many can be purchased well below NAV. This is another issue never really discussed in the article, something which is especially odd since several of the recommended funds sell for well above NAV - GUT actually sells for more than twice NAV, which certainly seems the sort of thing worth disclosing.