I'd say there's a simpler explanation. Bitcoin has a limited predictable supply, so its price is mostly a function of the demand. And demand correlates with expectations, that typically follow the hype cycle [0]. I'm not sure how much someone managed to single-handedly manipulate the price, but the plain old human psychology, FOMO and the positive feedback loop for media writing about bitcoin demand definitely played their role. All by the book really.
[0] https://en.wikipedia.org/wiki/Hype_cycle