Part of the problem with this stat, which I saw someone point out on Twitter, is that conservative demographics have changed since 2011. College-educated white

Part of the problem with this stat, which I saw someone point out on Twitter, is that conservative demographics have changed since 2011. College-educated white voters, especially women, have shifted significantly toward the Democratic party during the Trump years, and that was probably the biggest listener demographic for NPR. So NPR listeners in 2011 and 2023 could be the exact same people and the % of conservative listeners would have gone down. (That said, I suspect this isn’t the only explanation - NPR content has gotten more ideologically left during that timeframe too)