Edit: This has been completed. We needed to move to a CPU optimized server which is now complete. Shouldn't be any more issues aside from instances being unable to respond or federation issues not properly delivering your inbox notifications.
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I'll be doing a push notifications server migration tomorrow as we prepare for a full release. This might be down for a bit as I do that, but it shouldn't take too long.
If you get any old notifications, that's a result of the data not being up to date. Shouldn't be a huge deal, but it might happen.
On that note, Apple replied to the review today stating that we did not have a proper account deletion feature. I've made some changes to the app and given them additional details on how things work. Regardless, I think with the new change we should be 100% within guidelines. Hopefully they pick the review up tonight or tomorrow.
Cheers!