This is a case of the media buying into their own BS. Essentially, the author is saying 'Danny didn't do any of the things we said he would do, so we rated him badly for it'.
In terms of Fultz vs. Tatum, why is some writer's opinion more valid than that of a long-time NBA player and GM? Guess what? It's not. If Danny would have drafted Tatum first anyway, and Philly was going to give something back for the chance to draft Fultz, why not take that offer? And to follow this guy's logic, might Fultz be better than Tatum in the long run? Maybe. Will Fultz be better than Tatum and whoever is drafted with the LAL or SAC pick. Most likely not.
In terms of Paul George, Jimmy Butler, etc., the media kept linking the Celtics to those players, but it doesn't look like Ainge actually seriously considered either of them, and Indy's GM said the supposed offer on the table didn't exist. All along Hayward was their guy, and since all those guys play essentially the same position, there wouldn't be a point in bringing more than one of them in. Not to mention that all Hayward cost was money, while either of the others would have required trading at least one significant player and some picks. I think this was a good long term move, and again, Stevens knows Hayward from his college days, and Ainge decided he was the best option of these three. How is that a bad grade?
The media gets more stupid by the day.