Well… you know, this actually wasn’t my idea and I’m not sure it would actually work, but playing devil’s advocate here...
...anybody notice that Hermione’s testimony contradicted itself? No; if they had, it would already have mattered.
...anybody notice that Hermione knew something she shouldn’t at her age? No; she reads too much.
...anybody notice that Hermione knew something she shouldn’t about Important Player In This Game? For instance, being able to mention what Voldemort looked like. It could be a subtle reference that Harry would have to point out because it flew under the radar. But it would really hurt Harry’s relationship with Lucius.
...hey, notice how Hermione didn’t know something Hermione should have known? It’d have to be subtle, but maybe if she mentioned uncertainty about something she should have known, it could do something...
Well, I don’t know. Eliezer’s got me stumped this time.
Interesting. I hadn’t thought about that. Now that I think about it, you’re right; most fictional magic does act on things that are fundamental concepts in people’s minds, rather than on things that are actually fundamental.
That said, I still say it all sounds like magic. I couldn’t tell you exactly what algorithm my brain uses to come up with “sounds like magic”, though.