Netatmo tweeted the following on 22nd April 2021, so it is on the way.
https://twitter.com/netatmo/status/1385 ... 99936?s=20Big news: the Smart Outdoor Camera is adding HomeKit Secure Video support! An automatic software update will be made gradually available to all Netatmo Smart Outdoor Cameras (with or without Siren) in the upcoming days
Don't worry, the Smart Video Doorbell will be next