You are complaining about the photo monitoring functionality, which happens 100% on device. You can confirm this very easily by monitoring the app’s network activity when you receive an image. Android System SafetyCore does a lot more things than photo monitoring, one of which is providing emergency location data (ELS). This is required by law in the EU, India, and the USA.
This seems to be the latest one. https://simplex.chat/blog/20241014-simplex-network-v6-1-security-review-better-calls-user-experience.html