Communication protocols that incorporate spread spectrum (code/direct sequence for GPS and chirp spread spectrum for LoRa) get a "processing gain" at the stage of the receiver where the signal is despreaded. The resulting signal will have an SNR roughly equivalent to a narrow band (non spread spectrum) signal with otherwise the same parameters. You will have a generally equivalent bit error rate for the same SNR.
It's also possible to receive non spread-spectrum signals below the noise floor, if you can observe it over longer time and get additional "processing gain" that way
Additionally, it is a bad idea to use spread spectrum as a means of concealment because if the adversary is physically near enough, your signal will show up above the noise floor. Due to the inverse square law etc, you have a narrow zone of enough power to be received by your remote recipient, but not enough power for closer adversaries to detect you. You are also reliant on the unlikely situation of an adversary without more advanced RF hardware with lower noise receivers.
It's also possible to receive non spread-spectrum signals below the noise floor, if you can observe it over longer time and get additional "processing gain" that way
Additionally, it is a bad idea to use spread spectrum as a means of concealment because if the adversary is physically near enough, your signal will show up above the noise floor. Due to the inverse square law etc, you have a narrow zone of enough power to be received by your remote recipient, but not enough power for closer adversaries to detect you. You are also reliant on the unlikely situation of an adversary without more advanced RF hardware with lower noise receivers.