Prop. 16 was a complete fukkup, everyone knew the whole time that the ballot language was confusing and voters weren't clear on what they were voting for and why. Your own article says exactly that. Those campaigning against the measure were better organized than those who were for it and got their message across better.
Most major Asian-American civil rights groups supported the measure, including:
* Asian Americans Advancing Justice - Asian Law Caucus
* Asian Americans Advancing Justice - Los Angeles
* Asian Pacific American Labor Alliance
* Japanese American Citizens League
* Chinese for Affirmative Action
* Organization of Chinese Americans
* California Democratic Asian Pacific Islander Caucus
Varsha Sarveshwar, president of the University of California Student Association.
Gaurav Khanna, professor of economics at UC San Diego
While the direct effects of affirmative action on college admissions are well known, new evidence from India shows that affirmative action has indirect benefits on the behavior of underrepresented high school students, who tend to stay in school longer when they know higher education is within...
today.ucsd.edu
The racial breakdowns on Prop 16 were weird. This was the last poll:
WTH? Only 58% of Black voters in favor with 33% against, even though it's clearly pro-Black. Latinos were slightly against the measure somehow, even though it would have helped them. And Native Americans were the strongest against it even though it would help them the most! In that context, I don't see the slight 50-40 polling by Asian-Americans to be against the measure as a big deal. 50% of Asian-Americans were just agreeing with 33% of Black folk. Obviously, voting on this measure ended up being some weird, nuanced shyt.
The only counties who voted for Prop 16 in the end were San Francisco (64%), Alameda (59%), Marin (56%), San Mateo (51%), Santa Cruz (52%), and Los Angeles (51%). Considering California's demographics, obviously it was rural White California and the lack of unified support in the Black/Latino communities that played the biggest role in stopping it from passing. Yeah, there were a certain component of Asians who were against it (mostly aspirational lower-attainment families who thought affirmative action would mean their children wouldn't get slots in good colleges and voted on that self-interest), but it's not what Asian-American activists were advocating at all.