That's true only up to a point. Tires will eventually wear out, no matter what kind, from normal usage. The rear cassette eventually wears out. And of course, the chain eventually needs to be replaced with regular riding.

I agree that if well cared for, most quality components will last a long time if well cared for. The front cranks should last several years, but eventually the teeth wear out, and the individual rings at the very least need replacement. Quality wheels should last years, but eventually the spokes wear out, even high quality ones.