Yea I was really surprised reading this that I know a few people who lived in that apartment complex. The complex holds 1800 households, and the whole city has ~50k, so that single complex accounts for 3-4% of Santa Clara’s total households. And only one woman has reported any issues, as far as we know.
That said, Santa Clara is basically a giant industrial superfund site already from the semiconductor industry, so I’m sure there are plenty of people being poisoned by the pollution in the area.