Being CEO is really just about a handful of things, when “times are good” anyone can do the job and still be successful. Reiterating what your alluding to.

I believe to be a great CEO you need a lifetime of experience, and that only comes with time. You can read a ton of great books out there but unless you’ve been through it, it’ll never be enough. Which is why I now recommend getting out of your comfort zone quickly when starting a company. You will surprise yourself very quickly what you can accomplish. If you are unable to do this whether your technical or not than yes they are right.