Specifically on Joe Jackson. No, DB Sweeney didn't not bat righthanded in Eight Men Out. He's confusing his movies. And I got proof below. Sure looks lefthanded to me. Also, he swings a black bat. Jackson called his bat "Black Betsy". The black was from (ew, gross!) tobacco juice. (Players back then would use 3 or 4 bats in an entire season; everyone swung a heavy bat)
Otherwise, though, very good article.
And you're right about the fictionalization in the book. It's been so long since I read it (decades) I forgot about that. But he did get the documented facts right.