most likely because of the userdebug build target, it allows to use adb root. Apps check on the build string that includes it. While there are ways to hide it, you could also get a “user” build. /e/ does offer them I think on some devices/channels (stable vs dev) if I remember correctly.
userdebug builds are welcome with developer types, but not for the majority of users. If it’s just an info-type message by the App and it doesn’t hinder you actively from using it I don’t see it as issue.