Indeed that article seems to announce its arrival
No commercial documents in French, though?

One conflicting example:
https://www.imcdb.org/vehicle_209445-Renault-5-1984.html
Is it an older model? Or a newer one with a modified badge?
Or did both 5 & LeCar coexist?

I'm not sure using "5" as chassis code is good, as a few of them have their real chassis code (R122-something)