This article is a controversial take, but I'd say there is some truth to it. France Unbowed is currently the party with the biggest pro-China sentiment, relatively to the extremely anti-China political landscape. From my (small) experience within the movement, I noticed that MLs were able to climb to high consulting positions. There is a clear strategy of using radical Marxist elements as an ideological engine, while using less controversial figures as public speakers.
The thing that makes us optimistic is how they evolved from moralistic anti-racism to a more militant and anti-colonial approach, and how they explicitly rejected transphobia. It is a movement that evolves, it keeps adapting.
However we must not ignore that Mélenchon isn't a ML, he is ultimately a moderate as he doesn't fully commit to revolutionary politics. The best we can hope for is that France Unbowed will be the fertile ground from which a new revolutionary movement can grow