These? Meltdown also uses side channel attack discussed long time ago. Still AMD CPU's are immune to it while Intel's are not.
So until there is POC of Spectre 2 for AMD, there is no reason to believe AMD is vulnerable.
Meltdown is Intel's own fault, but the OS level patches actually fixes meltdown and has been affirmatively demonstrated to do so. But don't believe for a moment a that AMD is immune to Spectre. The Spectre variants are just thin slice of the side channel attacks possible, time is in favor of the people trying to attack the processors, Intel, AMD, Arm, etc. Focusing on a specific variant is being stuck to a tree and forgetting the forest, and that tree may be in the process of being eaten by termites. It is like saying your immune to influenza H3N1 but wide open to the rest.
Technology is not religion, belief doesn't magically make anything better, but you can go on and bury your head in the sand, and believe what you want.