Very true. I never said the turbine is not a marvelous piece of engineering. But it DOES provide very little thrust.
What you meant to say was that the air flowing through the engine core provides very little thrust, because most of its energy is being extracted by the turbine almost immediately after combustion.
https://i.stack.imgur.com/47W9J.jpg
Note that here, the largest source of thrust is from the components that jets and rockets have in common (combustion chamber and the divergent section after the turbine) - though here, in a non-afterburning jet engine, the nozzle must be convergent rather than divergent, and that imposes a cost.