It could recreate missing episodes using the extant episodes. That's something worthwhile doing until someone finds them. It's not creating a complete new series.

People want to find the missing episodes because of their historical value as actual human artistic creations, and not because they want to watch a thing that looks like an old missing episode.

There would be as much value in an "AI-recreated" missing episode as there would be in taking the audio of a modern episode and using AI to create a new video track for it.

Even if it's motion comic level animation, it'd still be nice to see combined with the audio recordings.