Why is John Cleese not credited with Kirk DeMicco for screen story for Netflix's The Twits?

Hey this has been bugging me since I looked at it's IMDb page and other sources that say this. But in the IMDb page for The Twits (https://www.imdb.com/title/tt0498396/fullcredits/?ref_=tt_ql_1) says Kirk DeMicco is credited for screen story but not John Cleese. I tried to add John's name to it with proof of it at these links of https://www.variety.com/article/VR1117880020 and https://www.the-numbers.com/news/198540830-John-Cleese-Helps-The-Twits, but it wont put the edits up. I can edit it again and give you the edit submission once done. It should make sense that John Cleese should be also credited with Kirk seeing how not only did Wikipedia says they are screen story by but they have been working on this project for years.