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They call that out specifically at the end, CPUs with their own embedded TPM aren't vulnerable to this kind of attack as all the communication occurs within the CPU itself.

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Let me rephrase.

I know this attack doesn't apply to commonplace embedded TPMs.

I think the label of "security theater" doesn't apply to commonplace embedded TPMs.

"embedded TPMs" are not commonplace. Intel has been pushing this hardest, and Intel still includes the TPM on the motherboard chipset and not the CPU itself in all consumer models, as of the 13th gen, at least.

Intel PTT is now quite common, isn't it?

PTT is in the southbridge - That is, not the chip but motherboard chipset.

Southbridge was eliminated years ago. Intel PTT is present on the Intel PCH located on the processor die package, not a chip on the motherboard.

Isn't that only for laptop packages?

I can find lots of current motherboards with a chipset on them, even specifically calling it a PCH.

Yep, you're correct. I misread. The Northbridge has been eliminated entirely. PCH is separate.

Don't Zen 2-4 all have fTPM?

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