This specific detail—that the proposed map would eliminate four Democratic-leaning districts *and* leave only Fort Lauderdale, Miami, Orlando, and West Palm Beach as deep-blue strongholds—is not independently corroborated by multiple sources. While the general theme of the map shifting power is present, the specific elimination list and remaining strongholds are not confirmed by multiple sources.

While the web search results confirm DeSantis is making claims about population growth and the political advantage, the specific figure of '1.5 million Republican advantage' is not corroborated by multiple sources. The evidence confirms the general theme of population growth and political advantage claims.