I have heard this assertion with no proof or backing data a lot. There is an assumption but no explanation how kicking long time residents out of their homes due to tax pressure is a benefit to the community, or real estate market prices. Real estate agents and other service companies might benefit from more transactions.
There is also usually no mention that the main problem of Prop 13 is that it applies to commercial and industrial properties, not just individual primary residences. Individuals have a limited impact scoped to their life, but tax implications applied to long term corporations is what has an outsized effect.