I can't read the article because I don't subscribe, but just because CA laws allow it, private businesses can set their own rules, so it doesn't necessarily mean theme parks have to drop masks. Officially, I haven't heard anything from USH, SFMM, or Knott's.... just Disney.
Plus, as far as I know, nothing's been said about reservation systems.
They allow 5 free articles a month so you may have used up your 5 already. You can visit a different Southern California News Group (Pasadena Star News, San Gabriel Valley Tribune, Whittier Daily News, etc.) site and read another 5 free articles. All SCNG sites have the same articles so what you find in one can be found in another.
The latest from Brady MacDonald:
Six Flags Magic Mountain will increase attendance and ride capacity, drop mask requirements for vaccinated visitors and discontinue advance reservations as the state ends most COVID-19 health and safety measures.
Magic Mountain officials announced the changes to COVID-19 health and safety measures ahead of the reopening of the California economy on Tuesday, June 15 that will allow theme parks in the state to return to full capacity and end most coronavirus restrictions.
Magic Mountain will no longer require masks for fully vaccinated visitors starting on June 15. Unvaccinated visitors are strongly recommended to wear a mask — especially while indoors. Six Flags employees will continue to wear masks and undergo temperature screenings.
Online advance reservations will no longer be required for admission to Magic Mountain. Out-of-state visitors will be permitted to visit the park beginning on June 15.