First MV and song post renewal is a Japanese comeback that half the fandom still won't care about as it's a pretty generic Twice pop song. On top of announcing a new comeback more than 6 weeks in advance that will lose most of its momentum by release as the renewal high has already peaked and will be going soon.
If there's one company that doesn't know how to use momentum, it's JYPE.
If they had announced the renewal a week or so before the August comeback the anticipation would have been huge but they have an MV and a full album in Japan before the actual comeback more fans will tune into.