The likely hood is that a motherboard without TPM 2.0 will not be supported (or even be able) to install Windows 11. If the motherboard model is supposed to have that support then check with the motherboard manufacturer.
Currently the requirement is for TPM 2.0 support but this may change over the coming years. (anything is possible but I wouldn't hold your breath)
in addition the ASRock site spec seems to suggest support for a TPM header so it may mean it had to be enabled or you need to buy a module. But if it is TPM 2.0 I can't tell.