The github issue that never made it in this news: https://github.com/AMDESE/AMDSEV/issues/292
Silent enshittification in the name of updates is getting out of hand. There are several evidences that downgrading BIOS/AGESA to below 1.2.7.0 to 1.2.0.3 brought back TSME for their AMD cpus.
I downgrade my bios as a price for my blind trust on AMD, and yes TSME is back.
You lost my trust AMD. The lesson learned is that if your PC with AMD cpu is stable, don't do any bios upgrade, as AGESA in the bios is adversarial to you, the users of AMD cpu.
To people who silently downvoted this: please explain why you did that, you're doing things like AMD.