Always good to be cautious but no I don’t think this a scam at all!
This product can easily work (from a techincal point of view). Android Auto is a video stream and touch input basically, so if you reverse engineered the protocol and sent something different than Android Auto you could essentially use the Android Auto protocol to send whatever you want, same for CarPlay.
Infact there are already working examples that send custom information, the app AAGateway sends it’s own custom Splashscreen in certain modes.
Personally the first part of this website makes me think the reviewer has no idea what they are on about
- it won’t add AA or CarPlay to non AA/Carplay cars
- This setup process is common to all wireless dongles, AAWireless, Carplay ones, Motorola’s one etc.
The kickstarter even says this
It also doesn’t use Bluetooth, it uses bluetooth to detect the device, once dected it will use WiFi as BT does not have the bandwidth required.
I would call this some chinese product, not necessarily a scam
UPDATE:

This image even has a delay, about the same amount of delay that Wireless AA/CarPlay has, therefore i honestly believe this is a legit project.
UPDATE2:
They have 2 models, a CarrGenie and a CarrGenie Pro,
the CarGenie does wireless AA and Wireless CarPlay just like AAWireless and CPLAY2air
the CarGenie Pro converts your factory AA or factory CarPlay in to a full Android 11 system
That’s actually awesome!
UPDATE3: reading comments, the owners have replied to 10’s of 100’s of comments in the last 4 hours, while this doesn’t prove it’s a scam or not, it’s good to see they are atleast replying
none of this says it is or isn’t a scam, but technically it’s possible, and likely if not this product someone else is already doing this.