I definitely agree this is silly as an issue when directing to one specific record, but I imagine it's because in order for Survey123 to find it, it has to be in the Inbox to be able to load. So even if you're going to one specific record, it has to be there, which means any record you might want to edit needs to be there.
I have some forms queried to the last 7 days to keep this lower, it might be worth reviewing if you need to have all of those records in there still, or if this is the best way to go about editing them.