1. In this proposition, there is an implicit premise that the poor are China people (mainlanders) and the rich are foreigners (Hong Kong, Macao and Taiwan people), which is incorrect. There are rich and poor people in China, and foreigners are not all rich.
2. Whether to export or not depends on whether the goods leave the country, not on poverty or wealth. Reducing the total export cost (tax-included cost is naturally higher than tax-free or tax-less cost) and improving the competitiveness of products in the international market are aimed at encouraging more foreign exchange (or foreigners' money) and will inevitably increase domestic employment opportunities.
3. When the goods are actually exported, they are not necessarily sold exclusively to developed countries, but also to some poor countries like Africa; Even if it is sold to developed countries, it is not necessarily only the rich in those countries can consume it.
after understanding this, is your question still a problem?