https://www.welivesecurity.com/2018/01/05/meltdown-spectre-cpu-vulnerabilities/Not accurate.
In fact AMD archs also do not bother to check if the speculatively executed memory access request is valid. You can read it in meltdownattack site's document in p.6.4. Threre is a theoretical possibility to configure the attack that way that leakage can be performed also on AMD's archs by one or other way. But in fact AMD's server share in so low, that attacks on AMD hardware is near zero chances.
Updated as recently as today. Again states that AMD is un-effected by Meltdown.
Sound like you are referring to Spectre. Can you link the specific document in question?