Why make things up and assume when you could spend the time you took to write your comment to read the facts?
> from far-left parties
No. Emmanuel Macron, the president, fairly right-sided, pushed it and then everybody welcomed it except some people at the right.
Now of course he could use something good for his image, he pretty much pissed most people a few months ago with how he used every non democratic ways he could to push his retirement reform despite a majority of people being against it (including people mostly agreeing with the content of this reform, but not comfortable with how he handled it).
Actually far-left sided parties are vanishingly small and wouldn't have the power to push something like this.
> who are utterly powerless when it comes to economic policies
Off-topic and not needed here.
Edit to answer the edit: La France Insoumise is hardly far left. It is roughly between le parti socialiste which had almost vanished two years ago, and le parti communiste, itself before Lutte Ouvrière and the NPA. I believe "far" is synonymous with "ideas I really don't like" and better avoided anyway. It doesn't do any good, let's properly reject bad ideas with proper arguments instead.