Put simply, they could not retroactively apply new changes to you.
Sounds like they could though?
Jokes aside, this is another in a recent string of "let's pretend our ToS are legally binding documents as fool-proof as the law" actions by major companies because ... well, who's stopping them?
Check it out.
https://leginfo.legislature.ca.gov/faces/billTextClient.xhtml?bill_id=202320240SB799
This is a bill to amend the existing laws. The amendment is really just about removing hurdles, period. There really aren't added stipulations about who it applies to. They also took the opportunity to make the wording more inclusive of everyone, dropping him/her, etc.
Proud of my state today.