The research here says nothing about mosquito bites, or people at all (whether poor or rich). It measured neighborhoods, not people, and assessed containers of standing water and the mosquito larvae in them. The neighborhoods population densities are not recorded, so we don't know what this means about whether given you are poor, you will get bitten more; or whether given you are a mosquito, you are more likely to bite a poor person. For example, areas with abandoned buildings are possible less likely to have people living there, being post-industrial, etc.
This seems driven by junk that fills with water in abandoned areas and lets mosquitoes breed. Notice the high number of 'trash' containers in low- SES neighborhoods, 80% of which have larvae.
When they made a composite score based on the number, size, and number of larvae, you see that areas with more abandoned buildings (probably more likely to be industrial areas, and places where nobody lives) have about 2x the index, but this interacts with rainfall over the last few weeks. This is a little circular because the index incorporates things that have to be related to rainfall and depend on whether an area is abandoned (rain will fill garbage containers with water, leading you to count things you wouldn't count in a drier area), so it is hard to tell what the interaction really means.