Yes, this is correct. Here is the full reply I am giving to people when the email iodé for more clarification on the topic:
These new Google requirements will only apply if you use an Android device with full “Google Play Services” integration, such as with the “stock” firmware for your device. In that case, you can only install apps on your phone if the app developers have registered with Google. This limitation is applied even if the apps are not installed through the Play Store.
Thankfully, this limitation will not apply to iodéOS, as we will not directly be impacted by this restriction since we don’t have full Google Play Services integration (by design). You will still be able to install applications from F-Droid which will not need such registration by the app developers, or from Aurora (to allow anonymous installation of apps from the Google Play Store). Of course these Google restrictions may affect the availability of various apps if their developers decide to stop developing rather than comply with Google’s requirements. But again, there will be no limitations on installing apps as you now do with iodéOS. In fact, the end it may have an indirect benefit to us as more users realize that they need to seriously consider a de-Googled option such as iodéOS for their device.