It's good that Amazon Trust Services has committed not to use validation methods retired by the CA/B Forum, and I take Comment 1 to mean Amazon has not issued any certificates using method 18.104.22.168.6 after it was retired. However, I don't believe Amazon's CP/CPS is compliant with Mozilla's disclosure requirement. MRSP 2.2(2) states, emphasis added:
The CA's CP/CPS must clearly specify the procedure(s) that the CA employs to perform this verification.
Above the listing for 22.214.171.124.6, Amazon's CP 1.0.9 states:
The CA SHALL confirm that prior to issuance, the CA has validated each Fully-Qualified Domain Name (FQDN) listed below
Amazon's CP says, explicitly, that Amazon uses method 126.96.36.199.6. Amazon's CPS says, implicitly, that Amazon doesn't use 188.8.131.52.6. This makes it ambiguous whether or not Amazon uses method 184.108.40.206.6, and thus fails to meet Mozilla's requirement that validation methods be "clearly" specified in the CP/CPS.
Clear, specific disclosure of validation methods is important is because it provides RPs with assurance that the CA is aware of what methods are allowed. A blanket statement that a CA doesn't use retired methods provides no assurance that the CA is aware that a particular method is retired.
For the above reasons, I believe this is a compliance incident and requires an incident report as described here: https://wiki.mozilla.org/CA/Responding_To_An_Incident