They are no likely to be democrat than the average population.I apologize, I misread.
Both sections of that block still demonstrate that non voters are more likely to be Democrats than Republicans.
They are more likely to be independent than the average population.
And the results are unweighted, where this population is markedly younger and less white and should also be compared to a voting population of the same age to determine if nonvoting/voting or age had the impact.
Summmarized:
When checking on their political leaning of these non voters what you see an exchange of Republican party for independent non-party thinking. They do not lean Democrat more. They lean Republican less. It is also not nearly universal. In fact, it appears that non-voters are less politically leaning than any other group.