It’s loss/gain per 100k inhabitants. Sure some of the California stuff is true but plenty of people are leaving because of insane regulation, taxes, and other policies of the 2028 Democratic presidential nominee.
By insane regulation - you mean the restriction on construction of housing, which has created big increases in housing prices.
Ironically, California's Property tax policy - prop 13 - does create insane taxes - in that the taxes on existing homeowners are so low, the housing market freezes up, adding to the affordability problem. Texas' exceedingly high property taxes mean that it's expensive to carry unused or underused properties, so the housing market operates more freely.
In the end, it's the economy stupid. People are having to leave California (or not move here) because housing is just so stupid expensive. Just like the Iran War will become increasingly unpopular not because it's a war, but because of gas prices.