This is a conversation about history. It doesn’t include modern member states because they were not member states when the modern European colonization of Africa first occurred.
therefore,
EU flag doesn't fit here because it's a symbol that's used nowadays to represent 27 countries, not just colonisers. that's why I initially said it was anachronistic
I wonder if this estimate assumes a constant rate of sea level rise or does it take into account that it's only going to accelerate. Seems quite low to me.