I am a bit surprised that this got published here. While those three attributes are certainly reasonable for outperforming funds, they can also be just as true for underperforming funds. Bad ideas held in a concentrated book with conviction can carry a fund manager out of the business.

Where is the data to support the author’s assertions?

This is more of an article for a site like Medium than something for a site as important as the CFA Institute. Please keep the standards high!