I agree it is different and you're probably right that it is not an original. It is stated on the website that it is ( HERE and the HPP article)

These are the Superteen Firebird Amenities:
- Hood with full-length air scoops (yes)
- Custom hood tach housing (no)
- Front body split bumperettes (yes)
- "Hawk's nose"-style front fascia (yes)
- Custom headlight assemblies/grilles with Cibie-type headlights (no)
- Frontal area of the fenders bobbed and canted (yes?)
- Brake cooling ducts (?)
- High-performance three-piece adjustable rear spoiler (yes, but different)
- Full sequential taillights (yes)
- Hurst mag wheels (yes, but different colour)
- Firestone GT F70x14 tires (no)
- Custom exhaust with non-functional side pipes (yes)
- Racing-style quick-release gas cap (yes)
- Rear body split bumperettes (yes)
- Silver Metallic Flake custom paint with cut glass for a "shimmering" look (no)
- Custom vinyl graphics package (no)
- Singer home entertainment unit cabinetry finished in hand-rubbed walnut -replaced the lower portion of the rear seat and included portable AC/DC television with mobile antenna, typewriter, stereo/record player, Muntz tape recorder and playback system and stereo tape deck cartridge music system, stereo speakers and storage system.

Here the rims:





I don't think the nose is more pointy. The original Superteen also had the "Firebird" emblem on the front quarter panel, just with an extra Superteen sticker:





Also, the "original" rear spoiler has a centrally located adjusting device, whereas this one has two on the sides:





Both sides have the scoops by the way. On the last pic posted above it appears that the louvers are still there, you're right about that. Then it is clearly on ongoing project of making it a Superteen: