It's not uncommon for Kickstarter card projects to assume that the "4-6 weeks" quote they typically get from the printers means that it will take 4-6 weeks from the day that they send in the art. Hopefully, people are starting to learn how much work goes into the pre-press process.
In general, Kickstarter projects are rarely in such an advanced state as the Tendril and Spectrum projects when they get started. The majority of the projects I've backed go to Kickstarter with just enough work to show that the idea is fully formed, such as having basic artwork or an early prototype, but they often don't know what it's going to take to make it happen. This is why a large number of the projects don't make their estimated delivery date.
In the case of the Mystic Techno Deck, I'm not sure whether what the designer has shown us is supposed to be anything close to the final product or not. We're supposed to get a new update any day now, but that's been the case for a few weeks. It's highly unlikely that it will get funded in this first round, but neither did Galvanic or Living Dead, and they did quite well the second time (though admittedly the Living Dead guys were much further along their first time, and then ended up being able to do more so they got more money). Hopefully if he decides to try again, he'll use what he's learned from the first attempt.