Another strange thing is the 100 € fixed between Light and Standard.

I would have understood the rationale for a 25% price difference, as discussed yesterday.
But 100 €? That's really cheap, and makes lounge access sound like a 20€-deal, which contradicts the move to premium that AF did the past few years.

All in all, as-is, this Light fare looks like decoy pricing to bump up AF flights in search results. Unbundling luggage is justifiable for the gazillion pax who travel HBO. If you start removing lounge on a J ticket and flexibility, you better give a real price cut - unless you don't really expect customers to pick this rate.