That seems a fair piece of writing to me.I never understand this idea that creative people are somehow different from "ordinary" people. The work so often comes from the faultlines we all have. One of my all time favourite poets is Philip Larkin. When his biography was published people were horrified to find he had faults; he collected pornography, he was racist, etc. But none of that diminishes his words on the page. After all, the richer the dung, the better the rose!
Whatever a biographer writes, it will always be only some facets of a full personality. Don't worry Joe, Woody was human, but the songs are divine!