This makes sense, a new user ignored should trigger user-updated, as most thing in the profile already do.
Everything in the Discourse UI can be done via the API.
Read How to reverse engineer the Discourse API to learn how and you will find:
curl 'https://meta.discourse.org/u/averymd/notification_level.json' -X PUT --data 'notification_level=ignore&expiring_at=2019-07-11+18%3A00-03%3A00'