I would warn you that the responses from the various staff that use the EtihadHelp handle frequently do not address the question asked, and often just request you to send your query to an email address.
Even if you were to get a competent answer from them, it would be no different than the responses you have got here - I wouldn't expect a thorough and rigorous listing of locations where an FB elite on an AF-codeshare can have access to EY lounges (even assuming that this is even possible).