Earlier quoted context omitted.
Seems like it is impossible to verify whether it is true because we cannot see exactly what they are doing. We are just taking their word for it. It can be nothing more than a "promise" because we are not the ones responsible for carrying out the encryption. We have to trust both (a) the encryption software, which we can examine, and (b) the third person doing the encryption, who is unfortunately operating outside ou…
"Promise" generally means a statement about someone's future behaviour; they're lying (or theoretically not) about something they already did (write the software in such a way that they are literally incapable of retrieving the plaintext of messages). If I say I'm not going to steal and eat your cookies, that's a promise, which I might reneg on or never have intended to keep in the first place, but ultimately it depe…
Never trust tech companies about anything. Wise words.