I have personal opinions as I work in a semi-related field, but I would prefer not to disclose that information.
In lieu of that, the questions I mentioned above were meant to be reasonably objective questions that would help me identify if an organization seems to be qualified in my mind without relying on reputation. Do you think any of those questions seem invalid? I tried to make them procedure agnostic to avoid discounting techniques which I am not aware of (so no, must use SHA, 2FA, antivirus, SGX, etc.). If you are willing to, are you able to identify any individuals you think have give good answers for most of those questions? Are there any questions that you think are unfair?
For instance, "Would you feel comfortable using the processes you have used in the past to develop a system where compromise would result in the loss of human life?". If the answer is no, I would not consider them an expert as there are many systems that are deployed today where compromise would result in the loss of human life (note that this does not mean those systems are appropriately secure). As an analogous case, if I found a civil engineer who made multiple bridges and then asked them, "Would you feel comfortable if any of the bridges you made in the past were used by humans?" and they said no, I would not be asking them for advice on making bridges for humans since they have never done it before.
If they answer yes to the question, I want to know why as I believe the default answer for most people is somewhere between "no" and "are you crazy". A really good answer would reference systems where they are confident in security, where compromise is valuable, have stood the test of time, and have withstood deliberate attempts to compromise against attacks in the vicinity of the value or compromise. For instance, "Person X did the security for Y bank. Y bank has a $500 Million bug bounty for system compromise (which is not onerous to collect)." would be pretty convincing. If your answer is a $500 Million bug bounty is absurd, you can look at some of my other replies under my original comment for why I believe that is actually too small.
If your answer is then that nobody is an expert, then my answer is that nobody should develop these systems since nobody knows how to achieve the minimum standard of safety. If it can not be done safely, then it should not be done at all no matter how hard you try if human lives are involved.