You are right, but I'm alluding to the intrinsic security flaw of the robot. What other flaws could exist? They need not be security related.

No, did I imply so? Just saying that I have very little confidence in the bot. I'm saying the intrinsic security flaw of the robot allows me to believe there are more serious defects. These do not need to be security related. The test cases not passing could lead to death.

I've made no commentary on VPN. Just commenting the communication protocol without augmentations (VPN, TLS, certificate, or otherwise) instills little confidence in the rest of the product. I wouldn't want to be operated under the bot.