On the topic of Fake 4K dash cams, and manufacture's lying about image sensor specifications.
I once tested a junk dash cam from Amazon, and I sent them test footage from the rear camera.
I asked them if it was really STARVIS 1 IMX335.
They sent me their test footage with the rear camera mounted externally driving down the Macau Riviera.
See it here;
After I found out it was a fake 4K dash cam I told them to send me a prepaid shipping label to send the camera back.
I never heard from them again.
One week later I saw 5 reviews on YouTube from the QVC / Home Shopping Network folks raving about this 4K dash.
Here's those fake reviews;