Read the Fact ! it’s because they are working on a separate deinterlace software, or maybe a proper implentation ! they also said that this update had many problems and they are working on a fix.
" Can I process interlaced video?
Not directly. If your video is interlaced, please deinterlace it first before using Video Enhance AI to upscaling it. We are working on a deinterlacer AI at this moment, stay tuned."