Disclaimer: I don't know for sure, as I'm not BD and don't speak for him, but the likely answer to this is because the Week 1 rework is a long project that will take considerable time. I'm sure if he could have gotten it ready in the time he's released the Day 8 updates, he would have released the rework as well. But he seems to be taking the approach of working on the rework in increments while still trying to release updates on some kind of regular schedule. He does have to keep his patrons happy after all, and based on posts I've seen of his, he would probably feel guilty making everybody wait for such a big update when they've already been waiting due to immense series of bullshit that this horrible year has put through.
I and many others don't think he should feel guilty for that, but that's the way it seems to be. At least him doing it this way means he's not pausing his Patreon anymore and is actually getting paid for all the fantastic work he's doing.