I think this is quite mistaken. There were big differences in how the campaigns (and presumably the candidates) thought about and used technology. These differences were visible at every level, from policies right down to the format of URLs. (Edit: the article itself makes this clear - who was courting Silicon Valley thought leaders at the start of his campaign, long before the money rolled in?)

As for the idea that one campaign didn't have overwhelmingly broader support among youth, just more money... that sort of denial leads straight to the political wilderness.