Why better technology creates more jobs
Let's say a company wants to build a feature that generates 10,000$ of value. If the cost of labor for building that feature costs the company 10,000$, the return on the investment is zero and the feature won't get built.
Okay let's say there's a new technology that makes developers 2x faster at building the same feature. Now company would still generate 10,000$ of value, but labor costs would only be 5,000$. That's a positive return on investment and the company will create that feature.
How many more features will this company now build in the future? A lot more of course, because there's a lot more positive ROI features available. The company needs to hire more developers to build those features, which will create more jobs!