Ahhh, the thieves have that cover, at least for the first go around. From the article...
The initiative applies retroactively to anyone worth $1 billion or more as of December 31, 2025, covering all accumulated wealth including stocks, real estate, artwork, and intellectual property. Billionaires would pay 5% of their total net worth over a five-year period. The retroactive application prevents wealthy individuals from avoiding taxation by relocating before the measure's enactment.