From the article:
The City takeover in 2008 heralded a new era for soccer. Mansour was not a boyhood fan or even an investor looking for returns. What he wanted was to use soccer to enhance Abu Dhabi’s reputation.
There are two ways of looking at this. The more generous interpretation is that it was an implementation of “soft power.” A less favourable analysis is that this is an exercise in ‘sportswashing,’ an attempt to use the glamour of the game to deflect from unsavoury aspects of life in the Middle East.[/I]
Maybe there are three ways of looking at this. The two he mentions, and the third is the one he dismissed out of hand in his previous paragraph.
1. The more generous interpretation - it's an implementation of soft power.
2. The less generous interpretation, the one that everyone is encouraged to believe is the real motive - sportswashing.
3. The most generous interpretation - Mansour is a football fan and an investor looking to make a return on his investment.
So without any actual evidence to support the concept that was invented purely to denigrate City, he chooses to promote the less generous option until the world is persuaded.
As Rabin and others have pointed out, if his motive was option two, he's not doing a very good job of it. If his motive was option three, he's doing an excellent job.