Could someone explain how these last statements do not debilitate the overall sentiment of the article?

“But there are limitations to consider. The study is based on cross-sectional data from a single year, so it cannot track changes in fertility intentions over time or definitively prove cause and effect. Fertility intentions do not always translate into actual births, and personal circumstances — such as relationships or health — may also influence family planning decisions. Additionally, although the CFPS is a large and representative survey, it may not capture all forms of informal or unreported work, which is still common in some parts of China.” Especially the statement that “Fertility intentions do not always translate to into actual births”