Income is multiplied by market share, and since you have 0% share from that colony it generates no income.
When you add the guy with IP that gives you an extra product to export which pushes your share up so your income is no longer multiplied by zero, but by a small number.
The more stuff you make in the same place, the bigger the slice of the market you control, the more money you get from both selling the goods AND the higher the multiplier applied to that income.