I understand AF position as mentioned by their call center.
When FB was introduced on 6 June 2005, it replaced FP. You need 10 years of continuous Plat status to earn Plat for life. Years as FP rouge count, but you need to have been Plat from the start of FB. Unfortunately you were only assigned to FB Gold in June 2005. Depending on mileage accumulated in 2004, some FP Rouge were given FB Gold and others FB Plat. The fact that you later earned Plat in November of that year, means that the starting point of the year count for 10 years is November 2005. Apparently there is no disagreement that you were only FB Gold before November 2005, even if for just a few months. In AF mind you have not been FP Rouge and FB Plat continuously.