I have evidence - it’s in the link. I also have proof, but I’m not comfortable with publishing my communication with the Google employee right now.
I have no idea why the penalty is in place. What I describe is “incredibly circumstantial.”
You say that my site poses no threat. Is that because it hasn’t seen traffic growth or become popular? The site is no threat exactly because the penalty is in place and has been for almost a decade. That’s a long time for a website. Traffic growth was very healthy before all of this.
The home page has been updated more recently than that, but you’re right that it still has the same page structure. With the manual penalty in place, it doesn’t matter how often I update the skin of the site or the home page text: the site is dead.