What would a strong left look like in France vs a Macron France?
It's probably just my US lens, but it seems more like they'd be natural allies in this scenario than "give the keys to the Nazis instead".
To add to what others already commented: I don't think something like the European left exists in this size in the US. The NFP includes communists and socialists while macron's economics are very much neoliberal. Also their positions on foreign policy are very differebt from his.
Macron's political choices and views are very much on the far-right side. It's repackaged in a somewhat more palatable way, but according to a lot of French people (myself included) he's one of the main reasons why the RN is so prevalent these days
Macron's a conservative man. His party has steadily shifted right almost as soon as he got into office. Ensemble is basically the new center right party of France.