Yes, you are wrong. There's a huge difference between trying to shut down conversation, as you seem to imagine such a reaction to be, and simply trying to keep conversation on someone else's site from spilling over onto your own, which is the most anyone could possibly hope for out of a referrer block.
Personally, if I'd been subject to the sort of ongoing campaign of abuse Ms. Debenham describes, I doubt I'd have held up under it one fourth as well. If I'd found the fortitude to post about it in the first place, seeing the post linked on HN might well be enough to convince me it'd been a bad idea talking about it in public at all. She seems to have found a happy medium between the need to protect herself and the desire to put her experiences out there where they might be of benefit to others, and I say good on her for it.
Personally, if I'd been subject to the sort of ongoing campaign of abuse Ms. Debenham describes, I doubt I'd have held up under it one fourth as well. If I'd found the fortitude to post about it in the first place, seeing the post linked on HN might well be enough to convince me it'd been a bad idea talking about it in public at all. She seems to have found a happy medium between the need to protect herself and the desire to put her experiences out there where they might be of benefit to others, and I say good on her for it.