I agree with that. A pitch is not just a verbal representation of a business idea or an investment proposal, but it needs to be backed with solid proof of success in similar ventures you have been into in the past because that is the only thing that will convince the people who you are pitching the idea to. As an investor, I wouldn't be interested in anything if they are just presenting something without showing any success proofs and maybe a portfolio or something that tells me that the person is capable of managing my funds very well.
So someone who is to pitch a Bitcoin investment idea, they need to make sure that they have been making such investments in the past and they have gained success in terms of getting profits from those investments and they should be able to demonstrate that in their pitch to have a higher success rate for the pitch.