A frank and open dialogue about hacking

So is it ok to report someone for being (suspected of being) a perma-banned SP user?
e.g., report Faders not for being "the famous hacker X" but for being "the perma-banned SPer Y"?

Really, no.
Unless you're reporting a post, blog, or VM here on this forum specifically where they openly confess to it, it's not actionable.

If we have the evidence necessary to remove someone, we remove them. If we don't, reports of hunches are just spam.

We either do not have what we require to remove them, or they're demonstrating behavior that we deem warrants a chance, and all trying to "out" them does is stir up drama and make a mess. Case in point;

Yeah, I've reported them as "mult's", out of 3 tries I think I was right once lol