How peculiar! It definitely says Aug 3 PC/Sep 6 PS5 for me.
PM me if that doesn't self correct within the next few hours, or if you do a full refresh of the page (sometimes I have to actually close the tab and reload the forums to get new posts showing in the Active Threads feed for some reason - other times it is fine).
I had the same issue, but once I cleared the browser cache (images) and reloaded the page, the new banner with the correct date appeared.
The forum performance is still perfect for me - fingers crossed it will stay that way.
