Probably mostly, but there are some like 帆 and 夕 that they may not know the 音読み for because they're not that commonly used. For example, there's a 四字熟語 順風満帆, which is read じゅんぷうまんぱん, but some people read it じゅんぷうまんぽ, because they only know the 訓読み for 帆 or mistakenly think it's the 音読み. Similarly, my ex misread 一朝一夕 as いっちょういちゆう, although it's actually いっちょういっせき. Again, the 音読み is seldom used, even in compounds (like 夕飯 (ゆうはん)).