Of course I would not advocate physically pushing the student out of the office.
> Instead, I sent an email to the class. I just said that there were cases of plagiarism detected and whomever cheated, could come and find me. For the rest, I would report the case . . .
I guess I just read this as an invitation to come and discuss the matter with you. And I understood from this that any who didn't come would be referred. If I were a student and reading this paragraph, I would make damn sure to speak with you about my indiscretions. That is the exact opposite of what I'm proposing, which is that you only refer students to the dean if they do come and speak with you.
Perhaps you meant to convey something different than what I'm getting from the blog post, if so, sorry for misreading.
> When the student comes in my office during office hours . . .
Once again, I've never been a professor, although I did TA for a while when I was in college. That said, I had an expectation that my office hours would be utilized in some way or another by students. I would propose prioritizing any student that wants to ask about something other than their cheating conviction. For students who want to talk about the cheating, just say, "If you really believe you did not cheat, we can discuss the evidence. But that will only happen at an academic integrity board hearing. If they find you innocent, I will regrade your work. Think about it and let me know by email if that's what you want to do." And then just refuse to talk about it.
Again, you're the professional and I'm the backseat driver. You know more about how this works than I do. This is simply how I imagine it would go, and although you've disagreed with me several times I still haven't gotten the impression that you did what I'm proposing.