I agree with everything you've said here, and it's possible that one could pivot the idea of ride-sharing for packages to something viable.
I think I could have made it clearer in the article, but my point was not that The People's Parcel was "the worst startup idea", but that "the worst startup idea" is that doing Startup Weekends and Y Combinator are the best ways for you to create a company that will help you climb the entrepreneur ladder.