Renaming a file giving date and time using Lightroom Classic does not work

Why is that time consuming? Select all videos and use that menu to change their capture time in batch, then rename them in batch. That doesn't cost more time than doing this on a single video. The video capture date is a problem that is caused by poor video metadata standards, making it not so simple (though definitely not impossible) to fix, because it means Lightroom would have to use different methods to establish the capture date for different camera brands. Not all videos from all cameras have this problem. It depends on how the camera manufacturer uses the standard. If you're interested, read this: https://community.adobe.com/t5/lightroom-classic-ideas/p-handle-video-capture-times-for-cameras-obeying-the-quicktime-mp4-standard/idi-p/14007948

Of course Adobe should fix this eventually, that is not the point. The point is that this is a fairly easy work around that takes only a little time. And something that you can use today.