Lol. No. Some things can be prevented by technical means and not fingers crossed he’s a nice guy means.

you're trying to imply that publishing a confidential message unencrypted but with a preamble that says "do not read" is exactly the same as using signal because signal could technically ship a compromised apk to you and leak your message everything is social pressure and trust at some level you're pretending to ignore that the levels of trust required are distinct