I actually agree that it's probably in Apple's best interest to let Epic back in, as much as I personally dislike the idea. But I don't think they are in any hurry to do so, and I'd bet it waits until the appeals are all done. And I certainly wouldn't begrudge them for not doing so. Epic behaved terribly, broke legally-binding agreements, and sued Apple - there's going to be bad blood there.
I actually think the most likely scenario is that Apple has already told Epic they won't be let back in at this time, and Epic is just doing this to drum up public support.
Maybe I'll be proven wrong though.
Edit:
Just saw this on another website; I completely forgot about the below. Apple is absolutely not letting Epic back on until at a minimum, the injunction is ruled on. From Apple's
filing (page 23):
If they let Epic back on then that entire argument for pausing the ruling falls apart. Can't see them letting Epic back on until that is resolved.