There is still a chance that you could recover your money if you provide proof though it has been a longtime since the deadline.
@Boussac was last online on 1st December, about a month ago so there's a chance that he will be back.
This is what he said to someone with a similar problem in May this year
Please bear in mind that this was an experimental no-login, no-fee wallet, not a paying service.
Users are welcome to reach out if they can prove they were actual user by providing all the details in their posession.
I do not respond to unsubstantiated claim because they are too easily made up and I don't have time for that anymore after 7+ years.
Try sending him a PM
Here are some more of his public contacts
boussac.75011@gmail.com
https://www.facebook.com/pierre.noizat
https://linkedin.com/in/pierrenoizat