Perhaps the "replacement" spoiler came with the SRT8 emblem and he just doesn't want to remove it for some reason.
It's hard to fault him when you see all the 1970-71 Convertible Hemi Challengers running around and you know Chrysler didn't make that many back in the day. It seems as if a 318 convertible will be rarer in the future as more individuals continue to convert them into RT/Hemi cars.
I myself have a "1970" Daytona (Clone) since I couldn't afford (nor would I pay) what they are selling for today. As long as you don't try to pass the car off as something it's not.....your options are wide open......
As for his SE.....I think most will know it's not an RT or SRT.....