I did look at her source and then looked at the source the source used.
https://www.irs.gov/statistics/soi-tax-stats-migration-data-2020-2021
All the story really shows is more people moved to Texas and Florida. The data certainly doesn't show people with higher incomes fleeing NY and CA.
The average income of people moving to California was $87,000
The average income of people moving to Texas was $88,000
The average income of people moving to Rhode Island was $90,000.
What the data really reflects is that incomes are higher in CA, NY, IL, MA so people leaving those states tend to have higher incomes.
If 1,000 median income earners leave CA and move to Texas and 1,000 median income earners leave TX and move to CA, then TX will have an increase in IRS earnings based on the previous 2 years when the earner lived in the CA. It shows nothing about what that person will earn the next 2 years. It could mean that the person that moved to CA now makes $84,907 instead of the $66,963 they were making in TX and the person that moved to TX may now be making $66,963 instead of $84,907. If that is the result, the person that moved to CA would be better off than the one that moved to TX.