The classic mistake of assuming that a page existing == the user existing. This user has a red linked page. The rest api does not give you information about users existing or not.

Category, File, User and MediaWiki are all page types that require custom handling at the application level If you want to properly render them.

@ARamadan-WMF
The user page does not exist in the fr.wiki even though it is still showing some default content when you tap on the link on the desktop.
https://fr.wikipedia.org/wiki/Utilisateur:Timeo66

Please close this ticket after you reply to the user, thank you!

@cooltey you have a 6 too many. it's https://fr.wikipedia.org/wiki/Utilisateur:Timeo66

In T352020#9365462, @TheDJ wrote:

@cooltey you have a 6 too many. it's https://fr.wikipedia.org/wiki/Utilisateur:Timeo66

You are correct! Thanks!

It seems the issue is that the user expected to see their User page, but since this user page doesn't exist, the app just shows an error and doesn't provide an option to create the page. This would then fall under T131284.