[swamp40]

He decoded everything, but he didn't actually open a car door. He still has to defeat the rolling code. It's not like you can add 1 to it and resend it. From the outside world, the next rolling code should appear random.

[paledot]

That's right there in the lede, "not as insecure as you think".

[ff7c11]

Is it hard to brute force? If so, it is still something that can be sniffed, though you can't unlock the car without first recording a genuine button press.