Smartthings finally got back to me after my hub has been offline for over a month. here is their response incase anyone else runs into a similar issue
Hi SmartThings Customer,
Thank you for your patience.
First, I want to start off by apologizing for the delayed response to your email due to a high number of support queries. We here at SmartThings support want to do everything we possibly can to help, to the furthest extent of our capabilities. I’m very sorry for the trouble.
After further investigation, it seems that your devices were removed from the system due to an abnormal error in one of our system processes. Your data is not kept after deletion and as a result, you will need to reconnect your devices to SmartThings.
This delete initially failed to complete, but was retried at the end of August and completed. The retries have been stopped and shouldn’t happen again.
Thank you for your kind understanding.