Pretty sure they meant if you need to keep a persistent public/private pair you can keep them in the tpm and initiate the exchange from there

The TPM comes out from the factory with a private key stored in it. The CPU has the public key.

You turn on the laptop for the first time, and the communication between the CPU and the TPM is encrypted from the start.

That's what I'm referring to. Can't this be done? I'm guessing it's not that easy because I'm sure computer designers have already considered this idea.