it is true, sorry you're misinformed. ask nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpq235tem4hfn34edqh8hxfja9amty73998f0eagnuu4zm423s9e8ks3f750r or do some reading on your own
there is nothing in grapheneos that prevents apps in the same profile from mutually choosing to communicate with...