I did ask for the output of another command (which would have made the output much shorter).
I see what I need here. You could order 2 x X6568-R6 (332-00374, FCLF8522P2BTL-NQ) which are supported 1Gb transceivers. (one for each controller)
Now, this is a rebranded Lenovo unit, unless Lenovo has another support matrix for transceivers, that should work.
You could plug those in, get 1Gb (RJ45) connections and add to the broadcast domain if you really want to get rid of those messages.
Or get a 2 x X6589-R6 (332-00279R6, AFBR-703SMZ-NA2, AFBR-709SMZ-NA2, FTLX8571D3BCL-(NQ), FTLX8574D3BCL-NQ) which are supported 10Gb optics. Plug up the optic as an access port and be done.
The third option I just remembered that I occasionally do: Set the NATIVE VLAN of the ifgroup to the same as e0M (if your network supports it). The Native VLAN is not tagged and if you then add a0a (or whatever your ifgrp is), that should stop the message.