I have come across a few other reinclusion requests that have been denied without the site being reviewed.
Imagine how many thousands of these free reinclusion requests are likely submitted every day from all over the world to Google. Now imagine how many human reviewers would be needed to handle these free reinclusion requests that are coming in every single day.
Since it is free request I am not surprised that Google isn't putting more resources into it or that the human reviewers don't spend hours reviewing each request. I am also not surprised that mistakes can happen when dealing with a project of this scale. Thirdly, I wouldn't be surprised if Google had some automated system to partially filter reinclusion requests to minimize how many are actually needed to be read by humans.