Did Novak Djokovic just enter the Vienna Open (Erste Bank Open) to pass the time?

Novak reached the quarterfinals of the Vienna Open, meaning he will receive 90 points, giving him 11,830 for the year - Nadal's 9850 in second place being 1,980 points behind. Reaching the quarterfinal was necessary to clinch first place; once he had done so, any extra points were essentially meaningless.

From this article on the clinching:

Nadal can only pick up a maximum number of 2,140 points if he wins both Paris and the Nitto ATP Finals in London

And as is further explained in the article, as they both played in the ATP Finals last year, Nadal will "lose" 400 points when he plays in it this year, while Djokovic will "lose" 200 points (as he finished one round earlier than Nadal), meaning Nadal is effectively 2,180 points behind; he can only pick up 2,140 points at this point, and thus cannot win (unless he plays another tournament, which is thought unlikely - also discussed in the above article).

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Further, Djokovic also said that he "did not feel like playing too much", as noted in this article, as a major figure in the Serbian Orthodox Church passed away on Friday (Amfilohije Radovic). It's possible this is simply explaining away his apparent lack of effort, or a legitimate reason to not have full focus in a game he certainly would have been expected to win.