Key Point: There is NO long term labour agreement. NONE It is a temporary agreement. (I will explain this shortly.)

The ode to Ben Smith is ridiculous, particularly the assertion that the labour woes were magically solved with his arrival. It's quite a leap, since Mr. Smith only was officially installed as of 27-September. It is even more astounding since Mr. Smith has a specific mission as defined by the BOD;
Benjamin Smith’s priority will be to define Air France’s short and medium-term strategic vision, find a solution to salary issues and set up a new company governance structure.

I will go one step further and say that the claim is an insult and dismissal of the work done since early last year to reach an agreement with the unions. The first step in the settlement of labour woes was the removal of multiple members of the management at Air France and that occurred many months before Mr. Smith arrived. In fact, if one wishes to sing praise, it should be to the management of KLM who were quite insistent on the need to change. They were supported by the Dutch government who were weary of seeing KLM employees held hostage by Air France and its uncompromising unions.

Note that the key labour (temporary) agreement came May 29 with the signing with the SNPL pilots union.

And now back to the key point: There is no long term agreement. What exists is a POSTPONEMENT; a delay, a kicking of the can down the road, because the real labour negotiations are about to start.

All that has been signed is a one year agreement. (As per the press release, the salary negotiations will start again in October 2019.) One year agreements do not ensure labour peace. They are a recipe for labour strife. However, in this situation they are an indication of an attempt at good faith bargaining to allow for the new management of Air France to get ready.

Air France will be starting labour negotiations with its most vocal and two most active unions now. As per the Air France Press release;

AIR FRANCE CONTINUES THE DIALOGUE WITH ITS SOCIAL PARTNERS AND OPENS CATEGORICAL NEGOTIATIONS WITH ITS FLIGHT CREW. Published on - October 24th, 2018
After signing a cross-category agreement for 2018 and 2019, Air France announces the opening of specific negotiations with flight crew representatives in compliance with the legal framework.
The categorical negotiations with the representative unions of the pilots will begin on 5th November. The negotiations with the representative unions of cabin crew will start on 7th November.

Let's revisit in a year and see if he is the golden boy with the magic touch.