Thanks for the clarification. That claim seemed really off.
I've assumed that what you see publicly is basically what's synced. Obv. your instance can have a few more meta details on you, like IP, device info, possibly all the exif they've stripped from uploaded photos, but these things aren't in the ActivityPub outbox
Wait a minute, is FLOSS home automation really this robust? Having avoided most wifi enabled gadgets, I'm pretty out of the loop here