An easy way to increase the number might be to recognize more discrete racial groups -- we frequently discuss adding a MENA category to the Census, and I believe Florida has considered recognizing a "Lusitanic" category in addition to a Hispanic one. South and East Asians can be broken up from each other.
The more races we have, the more existing marriages can be recognized as interracial, causing the statistic cited in your first post to soar.
True (and I believe Lusitanic would also not be a separate race), but the article OP posted cites a particular Pew Research poll as a source,
which counts Hispanic marriages to non-Hispanic individuals as interracial. If it were defined the same way the Census does, then a somewhat smaller number of marriages than 10% would be interracial.
