Yeah, I don't remember him giving any numbers on S2CH1 SG either, he just mentioned that he works on it from time to time and posted some previews.
But here's a quote from the WIAB dev log from early January, just to give an idea of how big those small bits and pieces can be (the last WIAB chapter released is chapter 3).
While this is just my pure speculation and I have no idea how much progress he made on S2 of SG, 1500 new renders of reworked S1 chapters and ~700 from the next WiAB chapter alone isn't bad at all.