Why does uninstalling some apps ask for my password or Touch ID?
Short answer: Apps installed by a system installer are owned by macOS, so removing them needs administrator approval. Cancel and nothing is removed.
Apps installed by a system installer are owned by macOS rather than by you, so removing them needs an administrator's approval. Storage Studio asks for your password or Touch ID so it can move them to the Trash cleanly, with the same recoverable result.
If you'd rather not approve, cancel and nothing is removed.