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TPM is now in firmware and has been for quite a few years on Intel and AMD processors; Intel's on the PCH which is on-package and AMD's on-die.

This isn't true for all implementations of TPM, but for AMD/Intel/Qualcomm where BitLocker is relevant, fTPM is used.

On company laptops this isn't always true, for instance here's the spec sheet of the ThinkPad T14 (this seems to be true for all ThinkPad models): https://www.lenovo.com/fr/fr/p/laptops/thinkpad/thinkpadt/th...

Where it states: Module dTPM 2.0 (Discrete Trusted Platform Module)