“ The state’s 30 wealthiest zip codes hold 20 percent of the state’s net worth, while making up only 2 percent of state population.”[1] This study uses zip code as a proxy, but it seems to be a lot less concentrated that 1% holding 46% of the wealth. By your logic, to be fair these taxes would need to be about half as progressive.
That’s not their logic at all. You’re looking at something that has possible correlations and overlap. Not close to fully accurate. Zip codes of many people including people not in top 1% does not equal top 1%
[1]https://lao.ca.gov/reports/2019/4093/ca-geography-wealth-090...