Yes and no, in the context Julian explains it here it is.
By the way, diaspora* does it way better, IIRC the origin of an origin posting becomes the hub for it, and every reply, reaction etc. goes to that instance and is actively spread back to every instance which is subscribed to that thread.

Later there came a way to fetch reaction which were there before your instance subscribed.

But: I use "view original URL" if I share the post somewhere else (eg. messenger) to point the source