It was above the 99.97th percentile for upvotes and above the 99.99th percentile for frontpage exposure—34 hours, which is astonishingly long: Only 323 stories have ever been on the front page for that long since we started keeping that data in 2014.
Even the most popular stories on HN get perceived as being censored or suppressed. I don't mean to pick on the OP here—these perceptions are a product of randomness plus bias, and we're all subject to those. But I want to save this example because it makes the point so strikingly: despite how convincing these perceptions feel, they have no evidentiary value.