This is clearly false. None of Nvidia, AMD, or Qualcomm manufacture their own chips. These companies are valuable despite not having in-house manufactures, perhaps because of it.

> half of chip making is in manufacturing it.

Correctness of this statement also depends on the type of chips.

Not everything needs the latest and greatest process node (which is predominately a fabless industry) except for advanced microprocessors, SoCs, or storage. On the other hand, 65 nm is perfectly fine for 90% of chips in existence, even 0.18 microns is still often used. You don't need EUV for a good LED driver, a serial port, or a battery charger controller. If we talk in this context, indeed, companies like Texas Instruments, NXP, ONSemi, Analog Devices, Microchip, etc, usually make chips in-house.

They dont have to outsource their Core Asset. If Intel ships 250M CPU annually there are also 250M Chipset going alongside with it. Those can go to TSMC or Samsung. ( Or in a turn of an event, Global Foundry )