The bitstream could be "final" without the coding tools being so.
You seem to be unfamiliar with the concepts of alpha and beta or other pre-release software. Seems a strange thing to be unfamiliar though in 2026
If you see the state of what is called "production quality" software these days, alpha/beta quality has lost most of its meaning. You now just wait for "next prod"
// I jest... but only to hide the sadness
No, they're pointing out how the logic they're replying to is flawed.
If there can be a decoder, there can be an encoder.