They used repeal and partial repeal interchangeably.

Prop 13 also pushes undue costs onto new property development. Lower development costs equals fewer luxury condos. Were California to both build more and repeal Prop 13 fully it's unlikely that retired tech bros would be priced out of their houses.

Even so one of the primary roles of a county assessor is to determine where tax breaks are suitable. Allowing the (typically elected) assessor more discretion via a Prop 13 repeal almost certainly guarantees you won't be putting grannies (or retired tech bros) out on the street.