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This is close but still incorrect.

Using your example, I blow a turbo and hobble to the dealer, who thinks the aftermarket IC caused the failure.

Ford doesn't have to prove anything - they simply deny the work under warranty. There is absolutely nothing you can do to make Ford fix your vehicle for free. They will refuse to touch it.

If you think you have a case, YOU spend money getting some independent testing done, certified automotive expert witnesses, the CEO of the aftermarket part, etc some/all willing to testify on your behalf in court - which you'll be paying for out of pocket until you (hopefully) win and then get reimbursed (if you win attorney's fees).

I readily mod but am always prepared to pay if something goes wrong.