Channel noise - A misnomer?
So, it's generally right that a receiver adds noise due to physics (Johnson-Nyquist noise). So, yes, in any system, at least part of the noise in the received signal is caused by the receiver.

There's also noise that is background noise from e.g. cosmic sources that happen neither in the receiver nor the transmitter (and also aren't other transmitters interfering), but those sources are typically far less important than receiver noise – at least in the microwave bands, where modern comms happen; in LF/MF/HF bands, background noise is very observable.