> Their rater helpfulness score must be at least 0.66 [1]
This is a good thing. The rater helpfulness score is how similar you rate a note as helpful/not helpful to how that note eventually is labeled. Because this determination is made based on how well it's rated among those with differing opinions, being accurate means your ratings tend to be less biased. Other accounts aren't voting on your "rater helpfulness score," so it's not subject to brigades.
The 48 hour thing is only for valid ratings, and that's only for the rating helpfulness score, so it's not to do with note ratings. Correct me if I'm wrong, but it looks like they were careful about the nuances that you've mentioned.
This is a good thing. The rater helpfulness score is how similar you rate a note as helpful/not helpful to how that note eventually is labeled. Because this determination is made based on how well it's rated among those with differing opinions, being accurate means your ratings tend to be less biased. Other accounts aren't voting on your "rater helpfulness score," so it's not subject to brigades.
The 48 hour thing is only for valid ratings, and that's only for the rating helpfulness score, so it's not to do with note ratings. Correct me if I'm wrong, but it looks like they were careful about the nuances that you've mentioned.