Anime is still quite popular in China, but Korean popular culture has become significantly less popular in China in the last couple of years. This is coming from someone who semi-regularly uses Chinese sites like Douyin, Xiaohongshu, Douban, Weibo, etc.
Back in 2017, most of the popular songs on Douyin were either American or Korean. Nowadays, they're mostly Chinese. I listen to them all the time. American and Korean shows used to be the most-discussed shows on Chinese social media but nowadays, they're simply not as popular as they were before. In my opinion, Chinese shows are not the best in the world, but they've definitely improved. Even someone like me, who is used to the quality of Western shows, started watching Chinese shows a few years ago.
Anime is enduringly popular though. I think that's because Japanese plots tend to be more interesting and I think this is one of the major downsides of China's censorship regime.