While not confirmed, it almost sounds like Drew Pearce and James Coyne’s work has been tossed aside, and this team is starting from scratch.
As the article mentioned, it’s rare for a writers room to be assembled to crack just one movie.
If that’s what it takes to make Sherlock Holmes 3 the best it can be, then ideally these writers will work efficiently together to craft an excellent story.
Just look back over the last year, and you’ll see that the Transformers, Hasbro and Godzilla/Kong franchises have formed these groups so they can tackle multiple entries.