It's not just chips, but also dust. Regardless, it has enough effect for the CDC to have a page about it:

https://www.cdc.gov/nceh/lead/prevention/sources/paint.htm

The study in the OP also specifically calls it out:

>Our estimates, based on leaded gasoline consumption, may also have underpredicted high-lead exposures owing to leaded paints and pipes, which tend to aggregate within particular communities (e.g., those with high rates of homes with lead service lines and lead paint in disrepair).