These are generic ones, if Arista claims that they no longer use the above MIBs to expose the AggregatePort details and indeed use Enterprise specific MIBs, then they have to let us know which OID they use to expose those details.
Otherwise, if they claim that they indeed expose the AggregatePort information in the above MIB OIDs, then they have to clarify why those details are not present in the current walks collected from the device andĀ a fix will need to be providedĀ from them.