Not because I know anything about Texas or California, or about traffic as a field, but because any data set - especially a list - can be used to present an argument and then be refuted due to "this detail". I see this on HN a lot and I believe that it has made me much less likely to be misled by someone toting data.
Austin has essentially nothing, the train they built is legitimately the dumbest, cheapest option that was offered at the time, though they are building dense housing along it now. People often choose which side of the river to live on because of traffic. You're simply not going to convince me that Austin isn't one of the worst cities to commute in, because unless you want to bike in 100ºF heat, you literally have no choice but to engage in it, especially if you have to cross the river.
East-West commuting is much easier. The wise strategy is to live East/West of town, not North/South.
If you dare go Eastside; or, worse, need to go from like Renton to Totem Lake; or Redmond to somewhere that isn't the the center of Bellevue, you're just never going to get there in a reasonable amount of time.
Renton to Totem Lake in particular is planned for 2024-25. https://www.soundtransit.org/system-expansion/i-405-brt
Also, Renton to Totem Lake should only be one connection given a weird sound transit airport route (590?) from West Seattle to Bellevue that goes through Renton.
According to this, Austin Texas is #10 on this chart.
*two* of the top 5 worst traffic areas in the US are in the Greater San Francisco area.