There's no official episode titled or directly associated with "libvpx." It sounds like you may have a video file (e.g., a .mkv or .webm encoded with libvpx) of that episode and want a guide on how to play, convert, or troubleshoot it.
ffprobe -v error -show_streams "Young Sheldon S02E09.libvpx.mkv" | grep codec_name young sheldon s02e09 libvpx