presumably the elected havent decided yet

Yeah maybe

…or maybe Macron is opposing the Democratic decision to select Lucie Castets?

From the article.

NFP has put forward Lucie Castets, a 37-year-old economist and director of financial affairs at Paris City Hall, as its candidate. After Monday’s announcement, Jean-Luc Mélenchon, the LFI president, accused Macron of creating an “exceptionally serious situation”.