I watched the video as it was either embedded here or on facebook and did not read the description that is only offered by the youtube page. Even then the description doesn't tell you that it doesn't have a campaign. Right when I heard of this game I went to their kickstarter page and handed over $30 for a digital copy and this is what it looked like.
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Most people that are in their mid to late 30's that are actually old enough to have grown up when the Jason Movies were popular do not play games online. We grew up with Atari's, Nintendo's and Sega's and weren't weened on online gaming. They are alienating a big part of their demographic by not incorporating a single player story mode.
I didn't know it was multi player only until about 6 months after the game was in the works.