But it's more than that. A growth hacker invents hacks as a way to grow - clever, non obvious methods that drive adoption.
Things like the Reddit sockpupperts, the Dropbox two-sided incentive system or the Yammer variation of the Freemium business model are all things where a combination of technical AND commercial knowledge was the thing that drove the companies success.
That isn't technical marketing - it is elements of business model design, integration architecture and startup accounting.
If you think of a better name, excellent - but "technical marketer" undersells what is happening here.