"a writer’s character’s viewpoints don’t reflect the writer’s viewpoints!!!" actually, they do.
that doesnt mean having a, for instance, homophobic character means the author is homophobic. but how is the homophobia treated? is it criticized? is it excused, idealized? is it framed so that the homophobia is clearly wrong? does the inclusion of homophobia in the narrative serve a point?
writers, especially professional published writers, know that their writing has an impact, and the morals they put forward in their work reflect deeply on themselves. they know how they frame and present their work can completely change the result and effect it has.
so maybe the character’s viewpoints don’t say much about the writer, but how the writer presents this character and its viewpoints says a hell of a fuckin lot about the writer.