Seems unlikely to me, but of course this is all pure conjecture. If human history is any lesson, we've only been able to increase our levels of technology because of positive feedback loops facilitated by our ability to communicate. Could you build a better $technology without the relevant domain knowledge, passed down to you through human language? I seriously doubt it. Instead of making incremental improvements, you'd have to come up with the entire concept from scratch.

Edit: Individuals may be smart with or without language. I believe that to be an open question. But technology is the domain of culture, and communication between individuals (diffusion and reuse of ideas, especially) becomes a lot more important.