The RFA source in the taiwan news mentioned the replacement took place in Feburary, and you can see that Zhong Nanshan remains in a leadership role up to yesterday [1].
A similar source [2] to the RFA one mentioned that Zhong was replaced on a post called "新冠病毒专家组组长" (leader of the COVID expert group); he's more commonly known as "国家卫健委高级别专家组组长" (leader of the senior expert group in national health commission; see [1]). Judging from the titles it's likely normal personnel changes.
Not to downplay the issue here: there have been reports of doctors being forced to include herbal medicines in the treatment from higher up, despite having little evidence supporting their efficacy. Just a random fact check.
Sources (all in Chinese; note epochtimes doesn't have a particularly good reputation):
[1]: https://www.fmprc.gov.cn/web/fyrbt_673021/t1755063.shtml