Edward says this himself. Practically "Please be careful with my input". That said, his input is not nonsense. No one should take any writing at face value. Always ponder the message, the consequences and if there's an even better way.

Edward Snowden: [...] Just because I say it, doesn't mean it's gospel. I can be wrong about an incredible amount of things. Nobody should trust me. Nobody should grant any sort of outsized weight to what I say.