It is clickbait which will hype the show to the next level. Remember when TAs made a reasonable HP game the most talked about game online for weeks leading it to become the best selling game of the year. Hilariously Chilton doesn't know he is being used to make JKR, Warner Brothers and the Indy money.
The Indy runs that article then a day later runs this positive article adding to the hype and interest about the cast.
Harry Potter TV show cast rumours, from Voldemort to Snape
Many famous names are being bandied around for HBO’s high-profile TV adaptation of the books
Whether you like it or not, Harry Potter fever is sweeping Hollywood once again – this time thanks to a high-profile TV series that’ll take over screens for a decade.
HBO and Warner Bros are behind the new project, which, in their own words, is “drawing a lot of rumour and speculation” about who will play the show’s primary characters.
https://www.independent.co.uk/arts-entertainment/tv/news/harry-potter-movies-cast-tv-hbo-max-b2697730.html
Meanwhile
Harry Potter reboot quietly rejects 42-year-old man's Hermione audition
https://www.dailymail.co.uk/news/article-14168149/Man-42-fails-audition-cast-Hermione-new-Harry-Potter-TV-adaptation-30-000-applied-roles-show.html#newcomment