As stated in the article, the 40 year lifespan is a lie from 'les verts'.
The facility was built for 40 year with minimal maintenance.
This is not the lifespan if the facility was well maintained.
Maintenance for nuclear in France is not "minimal": for the past two years (2018 2019) capacity factor of nuclear power in France has been around 70% mainly due to maintenance according to RTE (1)
For reference best UK offshore wind farm had 55.3% capacity factor in 2019 and UK offshore wind average capacity factor was 40.6% in 2019 (2)
