Throw out bearing
Reads like when its spinning with no pressure its making the noise
Coast down a hill engine off in Neutral clutch pedal up
The pressure plate will not be spinning, engine off, so throw out bearing will not be either, so no noise, if that's what it is
Pilot bearing is only used when clutch pedal is down, it allows the transmission's input shaft to spin at a different RPM than the engine, so its inner and outer sleeves are spinning at same RPM with clutch pedal up, its possible for it to make a noise that way but would be an odd failure, and would expect more noise with clutch pedal down
Same for clutch disc, its only spinning at a different RPM from the engine when pedal is down
Throw out bearing is in contact with pressure plate forks all the time, and with clutch pedal up it should spin freely with the pressure plate, if its not then you could be hearing that as metal scraping noise
With clutch pedal down throw out bearing is forced to spin at pressure plate RPMs so no noise
You probably should change it