I also agree. The article does present most of the information. The problem is not even the title.

Most people understand that titles/headlines are attention grabbing, click bait.

The problem, as I see it, is that majority of Redditors take the implied meaning of the headline as the summary of the entire article.

As your proposed headlines show, the actual content in the article gives much better and nuanced understanding of the voting patterns.

I can easily say "duh, most democrats can't read anyways, no wonder a majority of their mail ballots were thrown out" using the headline. Using my 1.8x times stat, I could say "duh, most republicans, can't read anyways".