While this seems intuitively true, I have some pushback, and I think that the reliability record of e.g older generations of Prius backs me up.
While you do have effectively two cars (an EV and an ICE) crammed into one, you’re not actually using both at full capacity all the time, which cuts down a lot on wear and tear. Your ICE is almost never run under load before it warms up, and is kept running at its most efficient rpm most of the time, your transmission is running under less load since it has help from the electric motors, and is often simpler (the aforementioned Prius does not have a reverse gear for example).
No it’s not nearly as simple as a BEV, but a well implemented hybrid system is absolutely an upgrade from a full ICE vehicle.