Thanks Goldorak for sharing that.
At first sight I see some improvements compared to the current scheme, such as more consistency and more transparency.
Nonetheless I fear that the upgrade fares (would it be cash or miles) will increase when they say "les nouveaux tarifs"...
Like you I don't understand what is the "niveau anti-dilution". Is that a dissuasive sixth fare in addition to the five mentioned?
Also mentioning 5 upgrade fares (depending on the yields) and 5 payment options is particularly misleading.
My understanding of Oscar is that it is an AF interface for travel agents. Probably the one they use to upgrade tickets already with miles for their customers.