His post is super unclear but I think he is concerned about someone getting their hands on his source code. In general, a compiled Go binary is not trivial to reverse engineer, so there’s some security through obscurity there.

Not a whole lot, though. A determined reverse engineer will likely be able to grab something close to your source code without much difficulty, assuming you haven't applied any wacky obfuscation.

Not 'someone'. Google.

Your secrets are not safe by embedding them in a binary. Compilation is not (necessarily, and at least so in the Go compiler's case) security...