I tried doing the test the other day, and I come with a result. I admit I was wrong, but I've also discovered the reason why.

I reported a single post in the thread you provided with a similar text to "low value post, likely bumping service". It got of course deleted, but there's a second part to it.

If I go check the link on the report history, I see the following:  https://bitcointalk.org/index.php?topic=5377979.msg58778701#msg58778701  according to that, topic ID=5377979 BUT, on the original thread, the one you linked; topic ID=5375199

I don't know exactly where this change comes from, but that explains why I was under the impression that the whole thread got derailed