I would also love statistics. Right now the only public ones are from Consumer reports and TrueDelta (both on volunteer base) but not from Toyota.
Service campaigns are not related or conditional to warranties, but the good will (to maintain good marketing...) from manufacturer. Anyway, you should definitely get the current one if not already done.
By the way, the speed limitation ("limp mode") is not specific to CVT condition nor is it ever the problem itself. It's a "protection" mode modern cars enters whenever a problem of certain types is detected, whether with the transmission or something else, to prevent further damage. You'd still have to find what triggered it, it's not the issue itself (another area where toyotatalk is a bit off).