Yeah I thought so too, but I am not seeing it. Best I can tell, it acts as an interface with Cydia, but Cydia still makes the SHSH request itself. I tried looking for a "email your SHSH here to include them," but I havent found it.
Unless I am missing something, I dont think it will take "historical" SHSH (ones that are no longer signed, but that you have locally backed up) and feed those to Cydia. I could be wrong... so please, talk slowly and use small words 🙂