I doubt it's Gonzalo writing.
To begin with, he used to make no mistake in English, not even punctuation mistakes. Here, I see a punctuation ( ; ) error and save instead of safe, and an "even" that sounds weirdly positioned in the sentence to me (but I might be wrong).
Granted he could be writing in a hurry, but in the past his writing skills were perfect even under duress/stress.
Also, why would posting these lines be less dangerous regarding his IP address than posting some screenshot of him holding today's newspaper? I mean, if he goes back online, he might as well post a pic of him with the newspaper, it makes little difference. Or a voice recording if the pic metadata terrorise him.
I'm not convinced either by the Che Guevara-lookalike profile pic.