Yeah, those people are wrong. I'll explain why, and then ask you what you think.
We're allowed to claim. The host doesn't bar it. Now, when we lynch a player, we ideally want as much information as possible to work with. Of course, any information we have in the thread, Scum also has access to. So we need to be careful. We don't want everyone to claim D1. Otherwse we tell scum which roles they need to focus on.
That's why claims should be restricted to those under threat of a lynch. Imagine you lynch me Day 1, and I flip Cop. What d you gain from it? Even if I get killed tonight, at least it's not a mislynch. We only have a few lynches to work with, scum taking out the cop early is unfortunate but if it forces them to shoot at a player that could have been lynched, it's not terrible either.
He claimed Lie Detector, and he was one.