The headline points out one clear trend of the data: the absolute numbers and percentages of non-white residents continues to increase in every Chicago area county. (The one exception is a decrease in the black population in Cook County.) Many of these collar counties had few non-white residents just a few decades ago.
But, there is another possible headline here: as the minority population grows, the white population has decreased in every county except for Kane County which had a very small increase in the white population. It is not required that the white population must decrease when the minority population increases so this is notable.
As the population changes in the Chicago region, it is due to both increasing minority populations and decreasing white populations.