English is dumb. We got the term "seasoned" to mean like a veteran fighter, something aging properly and using salt and spice from the French "assaisoner" which means "to ripen / to improve with time" which we expanded upon by being like "when things become tastier" which is how we started applying it to using spices and salt...

In this case it means sort of speed running getting the oil sheen a cast iron cooking implement used to naturally get by just using it over and over when cooking over wood or peat hence "ripening" the pan. Way back in the day in England and France they didn't really use soap for dishes. You washed them with water and left them outside in UV light to sterilize them so all iron cooking things tended to naturally develop that nice carbon coat. Time and use made them better hence "seasoned".