Watching the video would help. Basically, it's a barely-held-together coalition that won't last for very long. Meanwhile the far-right has massively risen in popularity over the last few years.

hard leftists + fake leftists(Hollande, etc.) + environmentalists make up only 30% of the parliament

macron is doing everything in his power to diminish that election as much as possible; he's literally started talking to the far right coalition while ignoring the left-wing one; despite the left-wing one winning the most votes.