Ok, so these "AMD flaws" are nowhere near anything like Meltdown or Spectre.
According to their "whitepaper", it lets you pwn your PSP and chipset if you already have root access on the main CPU. In the worst case, it's like the Intel ME BUP bug from december.
It's useful for researchers, coreboot porting, breaking DRM, etc. But it's no use for a remote (or even unprivileged local) attacker.
Their website makes it look way more dangerous than it is.