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Ubuntu (on which Pop!_OS is based) only added support for TPM disk encryption in Ubuntu 23.10, so my guess is that you’ll have to wait for Pop!_OS 24.04
Note that, as I understand it, using TPM will only protect data on your encrypted disk if it is removed from your computer. If someone steals your entire computer, the disk will be decrypted on boot.
The disk will be decrypted on boot, but then they’ll have to contend with needing a password to log in
Unless recovery (single user) mode is enabled. If it is, you can boot right into a root shell from the bootloader.
