You should read the article. The reasons stated against upscaling were that (re-)encoding video files should generally be done in a way that preserves as much

You should read the article. The reasons stated against upscaling were that (re-)encoding video files should generally be done in a way that preserves as much of the original information and intent as possible. AI upscalers add information where there is none, thus modifying the video in a way that goes against that goal.