Why it's too hard to understand the purpose? I find it useful. He just combined the data and added the ban appeal thread link here in case moderators want to take a look. Indeed, the right decision was already made. But, Don't forget that if a ban appeal were created and they got some support from the community, moderators might unban them. This thread could help both Banned users and moderators as well. I didn't know that many ban appeals were made. Let's say someone was banned and created a ban appeal thread. Some prominent members know them and see the user as a good asset. They might want to help them by supporting their ban appeal.

From this thread, more people will be able to review their ban appeal and leaves their opinion about the ban. If a banned user gets a good number of support from the community and moderators feel they deserve a chance, they might unban them. Global mods are not always active. they might miss some of the ban appeals. This thread's data could be useful for them as well. They can check the ban appeals from here as well.