This statement in turn expands the confusion. Where is this statement based? East Asians, South Asians, Southeast Asians and Pacific Islanders themselves are not homogenous. Figure 3 of https://www.census.gov/prod/2013pubs/acsbr11-17.pdf shows that Koreans and Chinese have higher poverty rates than average Asian Americans. Doesn’t sound like East Asians fare drastically well economically. Table 10 on http://www.cis.org/sites/cis.org/files/articles/2012/immigrants-in-the-united-states-2012.pdf also contradicts this. See East Asia vs Asians data on poverty rate.
There are data for education as well but I believe it is the responsibility of the author to verify these claims.