May be because he asked multiple times to update his status on the sheet (tracker) but no one seems to be doing it. I am not sure who is taking care of May'21 sheet.
Now that is a possibility but I do hope that is not the case. I do see that someone updated his test information in remarks section and not under invite received date (I believe I made that update) because he hadn't received the email at that point and the update was only seen in the tracker.
There are a few users in May 2021, including myself, who update the sheet however it is all voluntary. Every user can actually request the edit permissions and do it themselves.